cleanup, remove broken whitespace

activemodel/lib/active_model/attribute_methods.rb

@@ -8,7 +8,7 @@ module ActiveModel
   #
   #   user = User.first
   #   user.pets.select(:id).first.user_id
-  #   # => ActiveModel::MissingAttributeError: missing attribute: user_id
+  #   # => ActiveModel::MissingAttributeError: missing attribute: user_id
   class MissingAttributeError < NoMethodError
   end
   # == Active \Model Attribute Methods
@@ -202,7 +202,7 @@ module ActiveModel
       #   person.name            # => "Bob"
       #   person.nickname        # => "Bob"
       #   person.name_short?     # => true
-      #   person.nickname_short? # => true
+      #   person.nickname_short? # => true
       def alias_attribute(new_name, old_name)
         self.attribute_aliases = attribute_aliases.merge(new_name.to_s => old_name.to_s)
         attribute_method_matchers.each do |matcher|

activemodel/lib/active_model/naming.rb

@@ -56,8 +56,8 @@ module ActiveModel
     #   end
     #
     #   BlogPost.model_name <=> 'BlogPost'  # => 0
-    #   BlogPost.model_name <=> 'Blog'      # => 1
-    #   BlogPost.model_name <=> 'BlogPosts' # => -1
+    #   BlogPost.model_name <=> 'Blog'      # => 1
+    #   BlogPost.model_name <=> 'BlogPosts' # => -1
 
     ##
     # :method: =~

activemodel/lib/active_model/observing.rb

@@ -49,7 +49,7 @@ module ActiveModel
       #   end
       #
       #   ORM.observers = :cacher, :garbage_collector
-      #   ORM.observers       # => [:cacher, :garbage_collector]
+      #   ORM.observers       # => [:cacher, :garbage_collector]
       #   ORM.observers.class # => ActiveModel::ObserverArray
       def observers
         @observers ||= ObserverArray.new(self)
@@ -328,8 +328,8 @@ module ActiveModel
       # Returns the class observed by default. It's inferred from the observer's
       # class name.
       #
-      #   PersonObserver.observed_class  # => Person
-      #   AccountObserver.observed_class # => Account
+      #   PersonObserver.observed_class  # => Person
+      #   AccountObserver.observed_class # => Account
       def observed_class
         name[/(.*)Observer/, 1].try :constantize
       end

activemodel/lib/active_model/validations/callbacks.rb

@@ -85,8 +85,8 @@ module ActiveModel
         #   person = Person.new
         #   person.name = ''
         #   person.valid? # => false
-        #   person.status # => false
-        #   person.name = 'bob'
+        #   person.status # => false
+        #   person.name = 'bob'
         #   person.valid? # => true
         #   person.status # => true
         def after_validation(*args, &block)