Improve changelog entry for ActiveModel::Errors#full_messages_for [ci skip]

Add a working example of how to use this new method.

2 files changed, 13 insertions, 4 deletions

diff --git a/activemodel/CHANGELOG.md b/activemodel/CHANGELOG.md
index e4c80b1bf8..9aee47bd52 100644
--- a/activemodel/CHANGELOG.md
+++ b/activemodel/CHANGELOG.md
@@ -1,7 +1,18 @@
 ## Rails 4.0.0 (unreleased) ##
 
-*   Add ActiveModel::Errors#full_messages_for, a method that returns all the error
-    messages for a given attribute.
+*   Add `ActiveModel::Errors#full_messages_for`, to return all the error messages
+    for a given attribute.
+
+        class Person
+          include ActiveModel::Validations
+
+          attr_reader :name, :email
+          validates_presence_of :name, :email
+        end
+
+        person = Person.new
+        person.valid?                           # => false
+        person.errors.full_messages_for(:name)  # => ["Name can't be blank"]
 
     *Volodymyr Shatsky*
 
diff --git a/activemodel/lib/active_model/errors.rb b/activemodel/lib/active_model/errors.rb
index 485eb1a40a..b60458b3c6 100644
--- a/activemodel/lib/active_model/errors.rb
+++ b/activemodel/lib/active_model/errors.rb
@@ -12,7 +12,6 @@ module ActiveModel
   # A minimal implementation could be:
   #
   #   class Person
-  #
   #     # Required dependency for ActiveModel::Errors
   #     extend ActiveModel::Naming
   #
@@ -40,7 +39,6 @@ module ActiveModel
   #     def Person.lookup_ancestors
   #       [self]
   #     end
-  #
   #   end
   #
   # The last three methods are required in your object for Errors to be