incorrect deprecation notice in ActiveModel::Errors

Oops, my bad, that was actually an issue with Mongoid, not ActiveModel.

The deprecation message is confusing though, it looks like it was copy-pasted from another method. Instead of:

"ActiveModel::Errors#generate_message(attributes, custom_message) has been deprecated. Use ActiveModel::Errors#generate_message(attributes, :message => 'your message') instead."

it should be something like:

"ActiveModel::Errors#generate_message(attributes, :default => 'your message') has been deprecated. Use ActiveModel::Errors#generate_message(attributes, :message => 'your message') instead."

(The warning is caused by using the key :default in the options, not by passing a string as second argument, which probably wouldn't work at all.)

Automatic cleanup of spam.