Drush update note about backups extended

I had problems with drush update backups in the past.
Those problems can be caused by different reasons. Mostly because of folder permissions.
A lot of issues about this are created in Drush's issue queue (like #1877324) and the solution is usually simple... just use "--no-backup" option when executing drush update.

Well this is an issue with a patch which can help ("try first, read documentation later") users by printing an extended Note when doing the drush update.
Full note looks like this:
Note: A backup of your project will be stored to backups directory if it is not managed by a supported version control system. (Run drush update with "--no-backup" option to skip backups.)