remove comment reference to old HttpUrlValidator

Author: Trim

app/validators/uri_validator.rb

@@ -49,7 +49,7 @@ def self.before_validation(raw, default_scheme='http://')
     return uri.to_s
 
   # Let raw value if error occured when we tried to parse it, because
-  # the HttpUrlValidator will manage it itself on validation
+  # the UriValidator will manage it itself on validation
   rescue URI::InvalidURIError
     return raw
   end