fixed comment in w3c_validator

railties/guides/w3c_validator.rb

@@ -21,7 +21,7 @@
 #
 #     Separate many using commas:
 #
-#       # validates only
+#       # validates only association_basics.html and migrations.html
 #       ONLY=assoc,migrations rake validate_guides
 #
 # ---------------------------------------------------------------------------
@@ -88,4 +88,4 @@ module RailsGuides
   end
 end
 
-RailsGuides::Validator.new.validate
+RailsGuides::Validator.new.validate