IgnoreNonVoice: fix desc. for enableIfModerated
IgnoreNonVoice: Add note regarding IRCds

Not all IRCds implement a `+z` like mode!
Update wording per @Mkaysi

Needs discussion?
Merge pull request #223 from GLolol/patch-1

IgnoreNonVoice: add note regarding IRCds && Fix #210