reformatting sentence

activesupport/lib/active_support/xml_mini.rb

@@ -9,7 +9,7 @@ module ActiveSupport
   module XmlMini
     extend self
 
-    # This module exists to decorate files deserialized using Hash.from_xml with
+    # This module decorates files deserialized using Hash.from_xml with
     # the <tt>original_filename</tt> and <tt>content_type</tt> methods.
     module FileLike #:nodoc:
       attr_writer :original_filename, :content_type