code cleanup: fix source code comment in r18607

git-svn-id: http://svn.redmine.org/redmine/trunk@18613 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/changeset.rb

@@ -284,7 +284,7 @@ class Changeset < ActiveRecord::Base
     return @short_comments, @long_comments
   end
 
-  # singleton class are public
+  # Singleton class method is public
   class << self
     # Strips and reencodes a commit log before insertion into the database
     def normalize_comments(str, encoding)