diff --git a/actionpack/lib/action_controller/metal/conditional_get.rb b/actionpack/lib/action_controller/metal/conditional_get.rb
index a93727df909c05e65ff5faeace91b8a05d38f6e9..b210ee342313b4c33a51621e96e678c70debd67b 100644
--- a/actionpack/lib/action_controller/metal/conditional_get.rb
+++ b/actionpack/lib/action_controller/metal/conditional_get.rb
@@ -13,9 +13,9 @@ module ConditionalGet
     end
 
     module ClassMethods
-      # Allows you to consider additional controller-wide information when generating an etag.
+      # Allows you to consider additional controller-wide information when generating an ETag.
       # For example, if you serve pages tailored depending on who's logged in at the moment, you
-      # may want to add the current user id to be part of the etag to prevent authorized displaying
+      # may want to add the current user id to be part of the ETag to prevent authorized displaying
       # of cached pages.
       #
       #   class InvoicesController < ApplicationController
@@ -32,7 +32,7 @@ def etag(&etagger)
       end
     end
 
-    # Sets the etag, +last_modified+, or both on the response and renders a
+    # Sets the +etag+, +last_modified+, or both on the response and renders a
     # <tt>304 Not Modified</tt> response if the request is already fresh.
     #
     # === Parameters:
@@ -54,11 +54,11 @@ def etag(&etagger)
     #     fresh_when(etag: @article, last_modified: @article.created_at, public: true)
     #   end
     #
-    # This will render the show template if the request isn't sending a matching etag or
+    # This will render the show template if the request isn't sending a matching ETag or
     # If-Modified-Since header and just a <tt>304 Not Modified</tt> response if there's a match.
     #
     # You can also just pass a record where +last_modified+ will be set by calling
-    # +updated_at+ and the etag by passing the object itself.
+    # +updated_at+ and the +etag+ by passing the object itself.
     #
     #   def show
     #     @article = Article.find(params[:id])
@@ -124,7 +124,7 @@ def fresh_when(record_or_options, additional_options = {})
     #   end
     #
     # You can also just pass a record where +last_modified+ will be set by calling
-    # updated_at and the etag by passing the object itself.
+    # +updated_at+ and the +etag+ by passing the object itself.
     #
     #   def show
     #     @article = Article.find(params[:id])
diff --git a/guides/source/4_0_release_notes.md b/guides/source/4_0_release_notes.md
index 1aaf5ebc9413a8eca6c178b63dd88c02bb24b03a..84a65df2bc9227551406d6801f3225c550f6a75c 100644
--- a/guides/source/4_0_release_notes.md
+++ b/guides/source/4_0_release_notes.md
@@ -229,11 +229,11 @@ Please refer to the [Changelog](https://github.com/rails/rails/blob/4-0-stable/a
       The method `change_table` is also reversible, as long as its block doesn't call `remove`, `change` or `change_default`
 
     * New method `reversible` makes it possible to specify code to be run when migrating up or down.
-      See the [Guide on Migration](https://github.com/rails/rails/blob/master/guides/source/migrations.md#using-the-reversible-method)
+      See the [Guide on Migration](https://github.com/rails/rails/blob/master/guides/source/active_record_migrations.md#using-reversible)
 
     * New method `revert` will revert a whole migration or the given block.
       If migrating down, the given migration / block is run normally.
-      See the [Guide on Migration](https://github.com/rails/rails/blob/master/guides/source/migrations.md#reverting-previous-migrations)
+      See the [Guide on Migration](https://github.com/rails/rails/blob/master/guides/source/active_record_migrations.md#reverting-previous-migrations)
 
 * Adds PostgreSQL array type support. Any datatype can be used to create an array column, with full migration and schema dumper support.
 
diff --git a/guides/source/action_mailer_basics.md b/guides/source/action_mailer_basics.md
index f981d0da47973fa59bd2545a6c50f9935c5a51f0..f6c974c87a077a52a7463c44af6eb25d17bd7a30 100644
--- a/guides/source/action_mailer_basics.md
+++ b/guides/source/action_mailer_basics.md
@@ -298,8 +298,7 @@ Action Mailer 3.0 makes inline attachments, which involved a lot of hacking in p
     ```html+erb
     <p>Hello there, this is our image</p>
 
-    <%= image_tag attachments['image.jpg'].url, alt: 'My Photo',
-                                                class: 'photos' %>
+    <%= image_tag attachments['image.jpg'].url, alt: 'My Photo', class: 'photos' %>
     ```
 
 #### Sending Email To Multiple Recipients
diff --git a/guides/source/association_basics.md b/guides/source/association_basics.md
index c9e0fcd939a022fb7ab992450e32df2b7ba2c914..61490ceb545a044c44c12845f86f1bd8ef4212ae 100644
--- a/guides/source/association_basics.md
+++ b/guides/source/association_basics.md
@@ -756,7 +756,7 @@ class Order < ActiveRecord::Base
 end
 ```
 
-Each instance of the order model will have these methods:
+Each instance of the `Order` model will have these methods:
 
 ```ruby
 customer
@@ -1342,16 +1342,16 @@ class Customer < ActiveRecord::Base
 end
 ```
 
-Each instance of the customer model will have these methods:
+Each instance of the `Customer` model will have these methods:
 
 ```ruby
 orders(force_reload = false)
 orders<<(object, ...)
 orders.delete(object, ...)
 orders.destroy(object, ...)
-orders=objects
+orders=(objects)
 order_ids
-order_ids=ids
+order_ids=(ids)
 orders.clear
 orders.empty?
 orders.size
@@ -1831,16 +1831,16 @@ class Part < ActiveRecord::Base
 end
 ```
 
-Each instance of the part model will have these methods:
+Each instance of the `Part` model will have these methods:
 
 ```ruby
 assemblies(force_reload = false)
 assemblies<<(object, ...)
 assemblies.delete(object, ...)
 assemblies.destroy(object, ...)
-assemblies=objects
+assemblies=(objects)
 assembly_ids
-assembly_ids=ids
+assembly_ids=(ids)
 assemblies.clear
 assemblies.empty?
 assemblies.size
diff --git a/guides/source/form_helpers.md b/guides/source/form_helpers.md
index 9ced77dfd7ec152dba06d6711835b308735c1c01..16fa23c129a68e476ec6b0d3fdbdc503498dd91c 100644
--- a/guides/source/form_helpers.md
+++ b/guides/source/form_helpers.md
@@ -506,6 +506,12 @@ As the name implies, this only generates option tags. To generate a working sele
 <%= collection_select(:person, :city_id, City.all, :id, :name) %>
 ```
 
+As with other helpers, if you were to use the collection_select helper on a form builder scoped to the @person object, the syntax would be:
+
+```erb
+<%= f.collection_select(:city_id, City.all, :id, :name) %>
+```
+
 To recap, `options_from_collection_for_select` is to `collection_select` what `options_for_select` is to `select`.
 
 NOTE: Pairs passed to `options_for_select` should have the name first and the id second, however with `options_from_collection_for_select` the first argument is the value method and the second the text method.