Fix potentially wrong command in warning message
Fix potentially wrong command in warning message

Improves the warning message by removing the exact command entirely and
referring to the proper documentation instead.

Co-authored-by: Rosano Coutinho <3f0ec57c0da513165ed98da3f63354518b117ba4@xeari.com>

remotestorage/remotestorage.js,remotestorage/remotestorage.js,remotestorage/remotestorage.js