Correct deprecated AR usage in ActionController::MimeResponds documentation

actionpack/lib/action_controller/metal/mime_responds.rb

@@ -63,13 +63,13 @@ def clear_respond_to
     # might look something like this:
     #
     #   def index
-    #     @people = Person.find(:all)
+    #     @people = Person.all
     #   end
     #
     # Here's the same action, with web-service support baked in:
     #
     #   def index
-    #     @people = Person.find(:all)
+    #     @people = Person.all
     #
     #     respond_to do |format|
     #       format.html
@@ -155,7 +155,7 @@ def clear_respond_to
     # Respond to also allows you to specify a common block for different formats by using any:
     #
     #   def index
-    #     @people = Person.find(:all)
+    #     @people = Person.all
     #
     #     respond_to do |format|
     #       format.html
@@ -178,7 +178,7 @@ def clear_respond_to
     #     respond_to :html, :xml, :json
     #
     #     def index
-    #       @people = Person.find(:all)
+    #       @people = Person.all
     #       respond_with(@person)
     #     end
     #   end