Additional tooltip/documentation

[ersan]

I honestly don't know what "Register User Clients?" means or whether I should check it or not, and I can't find any more information on it. Perhaps this description could be expanded?

[ngovil21]

This was used to force users to create a nickname, however with recent updates we check Plex for the username, so this is kind of obsolete. If you keep this checked then if for some reason the fallback fails, the user will have to register a nickname for their account.

I can't add tooltips, but I'll set up some info on the Settings in the wiki.