Fix ActiveSupport::Callbacks' define_callbacks and ActiveSupport::Concern documentation to look like native English

activesupport/lib/active_support/callbacks.rb

@@ -568,9 +568,9 @@ module ActiveSupport
       #
       # would trigger <tt>Audit#before_save</tt> instead. That's constructed by calling
       # <tt>"#{kind}_#{name}"</tt> on the given instance. In this case "kind" is "before" and
-      # "name" is "save". In this context treat ":kind" and ":name" as special thing where
-      # ":kind" refers to "callback type(before/after)" and ":name" refers to the method on 
-      # which callbacks are being defined.
+      # "name" is "save". In this context ":kind" and ":name" have special meanings: ":kind"
+      # refers to the kind of callback (before/after/around) and ":name" refers to the
+      # method on which callbacks are being defined.
       #
       # A declaration like
       #

activesupport/lib/active_support/concern.rb

@@ -4,33 +4,33 @@
 #     def self.included(base)
 #       base.send(:extend, ClassMethods)
 #       base.send(:include, InstanceMethods)
-#       scope :foo, :conditions => {:created_at => nil}
+#       scope :foo, :conditions => { :created_at => nil }
 #     end
 #
 #     module ClassMethods
-#       def cm; puts 'I am class method'; end
+#       def cm; puts 'I am a class method'; end
 #     end
 #
 #     module InstanceMethods
-#       def im; puts 'I am instance method'; end
+#       def im; puts 'I am an instance method'; end
 #     end
 #   end
 #
-# By using <tt>ActiveSupport::Concern</tt> above module could be written as:
+# By using <tt>ActiveSupport::Concern</tt> the above module could instead be written as:
 #
 #   module M
 #     extend ActiveSupport::Concern
 #
-#    included do 
-#       scope :foo, :conditions => {:created_at => nil}
+#     included do
+#       scope :foo, :conditions => { :created_at => nil }
 #     end
 #
 #     module ClassMethods
-#       def cm; puts 'I am class method'; end
+#       def cm; puts 'I am a class method'; end
 #     end
 #
 #     module InstanceMethods
-#       def im; puts 'I am instance method'; end
+#       def im; puts 'I am an instance method'; end
 #     end
 #   end
 module ActiveSupport