Change plings to the more conventional quotes in the documentation. Closes #10104 [danger]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8131 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/CHANGELOG

 *SVN*
 
+* Change plings to the more conventional quotes in the documentation. Closes #10104 [danger]
+
 * Fix HasManyThrough Association so it uses :conditions on the HasMany Association.  Closes #9729 [danger]
 
 * Ensure that column names are quoted.  Closes #10134 [wesley.moxam]

activerecord/lib/active_record/callbacks.rb

@@ -143,7 +143,7 @@ module ActiveRecord
   #     before_destroy 'self.class.delete_all "parent_id = #{id}"'
   #   end
   #
-  # Notice that single plings (') are used so the <tt>#{id}</tt> part isn't evaluated until the callback is triggered. Also note that these
+  # Notice that single quotes (') are used so the <tt>#{id}</tt> part isn't evaluated until the callback is triggered. Also note that these
   # inline callbacks can be stacked just like the regular ones:
   #
   #   class Topic < ActiveRecord::Base