[ci skip] Several ActionCable documentation updates:

* Properly indent code sample in ActionCable::Channel::Streams
* Add a doc comment for #stop_all_streams
* Reformat + add <tt> blocks around code references in ActionCable::Base docs
* Clarify and a little better grammar on ActionCable::RemoteConnections
* Correct indentation and clean up ActionCable::Server::Broadcasting code sample

actioncable/lib/action_cable/channel/base.rb

@@ -32,8 +32,11 @@ module Channel
     #
     # == Action processing
     #
-    # Unlike Action Controllers, channels do not follow a REST constraint form for its actions. It's a remote-procedure call model. You can
-    # declare any public method on the channel (optionally taking a data argument), and this method is automatically exposed as callable to the client.
+    # Unlike subclasses of ActionController::Base, channels do not follow a REST
+    # constraint form for their actions. Instead, ActionCable operates through a
+    # remote-procedure call model. You can declare any public method on the
+    # channel (optionally taking a <tt>data</tt> argument), and this method is
+    # automatically exposed as callable to the client.
     #
     # Example:
     #
@@ -60,18 +63,22 @@ module Channel
     #       end
     #   end
     #
-    # In this example, subscribed/unsubscribed are not callable methods, as they were already declared in ActionCable::Channel::Base, but #appear/away
-    # are. #generate_connection_token is also not callable as its a private method. You'll see that appear accepts a data parameter, which it then
-    # uses as part of its model call. #away does not, it's simply a trigger action.
+    # In this example, subscribed/unsubscribed are not callable methods, as they
+    # were already declared in ActionCable::Channel::Base, but <tt>#appear</tt>
+    # and <tt>#away</tt> are. <tt>#generate_connection_token</tt> is also not
+    # callable as it's a private method. You'll see that appear accepts a data
+    # parameter, which it then uses as part of its model call. <tt>#away</tt>
+    # does not, since it's simply a trigger action.
     #
-    # Also note that in this example, current_user is available because it was marked as an identifying attribute on the connection.
-    # All such identifiers will automatically create a delegation method of the same name on the channel instance.
+    # Also note that in this example, <tt>current_user</tt> is available because
+    # it was marked as an identifying attribute on the connection. All such
+    # identifiers will automatically create a delegation method of the same name
+    # on the channel instance.
     #
     # == Rejecting subscription requests
     #
-    # A channel can reject a subscription request in the #subscribed callback by invoking #reject!
-    #
-    # Example:
+    # A channel can reject a subscription request in the #subscribed callback by
+    # invoking the #reject method:
     #
     #   class ChatChannel < ApplicationCable::Channel
     #     def subscribed
@@ -80,8 +87,10 @@ module Channel
     #     end
     #   end
     #
-    # In this example, the subscription will be rejected if the current_user does not have access to the chat room.
-    # On the client-side, Channel#rejected callback will get invoked when the server rejects the subscription request.
+    # In this example, the subscription will be rejected if the
+    # <tt>current_user</tt> does not have access to the chat room. On the
+    # client-side, the <tt>Channel#rejected</tt> callback will get invoked when
+    # the server rejects the subscription request.
     class Base
       include Callbacks
       include PeriodicTimers

actioncable/lib/action_cable/channel/streams.rb

@@ -41,22 +41,23 @@ module Channel
     # Example below shows how you can use this to provide performance introspection in the process:
     #
     #   class ChatChannel < ApplicationCable::Channel
-    #    def subscribed
-    #      @room = Chat::Room[params[:room_number]]
+    #     def subscribed
+    #       @room = Chat::Room[params[:room_number]]
     #
-    #      stream_for @room, -> (encoded_message) do
-    #        message = ActiveSupport::JSON.decode(encoded_message)
+    #       stream_for @room, -> (encoded_message) do
+    #         message = ActiveSupport::JSON.decode(encoded_message)
     #
-    #        if message['originated_at'].present?
-    #          elapsed_time = (Time.now.to_f - message['originated_at']).round(2)
+    #         if message['originated_at'].present?
+    #           elapsed_time = (Time.now.to_f - message['originated_at']).round(2)
     #
-    #          ActiveSupport::Notifications.instrument :performance, measurement: 'Chat.message_delay', value: elapsed_time, action: :timing
-    #          logger.info "Message took #{elapsed_time}s to arrive"
-    #        end
+    #           ActiveSupport::Notifications.instrument :performance, measurement: 'Chat.message_delay', value: elapsed_time, action: :timing
+    #           logger.info "Message took #{elapsed_time}s to arrive"
+    #         end
     #
-    #        transmit message
-    #      end
-    #    end
+    #         transmit message
+    #       end
+    #     end
+    #   end
     #
     # You can stop streaming from all broadcasts by calling #stop_all_streams.
     module Streams
@@ -90,6 +91,7 @@ def stream_for(model, callback = nil)
         stream_from(broadcasting_for([ channel_name, model ]), callback)
       end
 
+      # Unsubscribes all streams associated with this channel from the pubsub queue.
       def stop_all_streams
         streams.each do |broadcasting, callback|
           pubsub.unsubscribe broadcasting, callback

actioncable/lib/action_cable/remote_connections.rb

 module ActionCable
-  # If you need to disconnect a given connection, you go through the RemoteConnections. You find the connections you're looking for by
-  # searching the identifier declared on the connection. Example:
+  # If you need to disconnect a given connection, you can go through the
+  # RemoteConnections. You can find the connections you're looking for by
+  # searching for the identifier declared on the connection. For example:
   #
   #   module ApplicationCable
   #     class Connection < ActionCable::Connection::Base
@@ -11,8 +12,9 @@ module ActionCable
   #
   #   ActionCable.server.remote_connections.where(current_user: User.find(1)).disconnect
   #
-  # That will disconnect all the connections established for User.find(1) across all servers running on all machines (because it uses
-  # the internal channel that all these servers are subscribed to).
+  # This will disconnect all the connections established for
+  # <tt>User.find(1)</tt> across all servers running on all machines, because
+  # it uses the internal channel that all these servers are subscribed to.
   class RemoteConnections
     attr_reader :server
 
@@ -25,7 +27,7 @@ def where(identifier)
     end
 
     private
-      # Represents a single remote connection found via ActionCable.server.remote_connections.where(*).
+      # Represents a single remote connection found via <tt>ActionCable.server.remote_connections.where(*)</tt>.
       # Exists for the solely for the purpose of calling #disconnect on that connection.
       class RemoteConnection
         class InvalidIdentifiersError < StandardError; end

actioncable/lib/action_cable/server/broadcasting.rb

@@ -4,19 +4,19 @@ module Server
     # broadcastings are streamed directly to the clients subscribed to the named broadcasting. Let's explain with a full-stack example:
     #
     #   class WebNotificationsChannel < ApplicationCable::Channel
-    #      def subscribed
-    #        stream_from "web_notifications_#{current_user.id}"
-    #      end
-    #    end
+    #     def subscribed
+    #       stream_from "web_notifications_#{current_user.id}"
+    #     end
+    #   end
     #
-    #    # Somewhere in your app this is called, perhaps from a NewCommentJob
-    #    ActionCable.server.broadcast \
-    #      "web_notifications_1", { title: 'New things!', body: 'All shit fit for print' }
+    #   # Somewhere in your app this is called, perhaps from a NewCommentJob
+    #   ActionCable.server.broadcast \
+    #     "web_notifications_1", { title: "New things!", body: "All that's fit for print" }
     #
-    #    # Client-side coffescript, which assumes you've already requested the right to send web notifications
-    #    App.cable.subscriptions.create "WebNotificationsChannel",
-    #      received: (data) ->
-    #        new Notification data['title'], body: data['body']
+    #   # Client-side CoffeeScript, which assumes you've already requested the right to send web notifications
+    #   App.cable.subscriptions.create "WebNotificationsChannel",
+    #     received: (data) ->
+    #       new Notification data['title'], body: data['body']
     module Broadcasting
       # Broadcast a hash directly to a named <tt>broadcasting</tt>. It'll automatically be JSON encoded.
       def broadcast(broadcasting, message)