Merge pull request #1680 from tamiko/master

update ChanServ OP command documentation

irc/chanserv.go

 			help: `Syntax: $bOP #channel [nickname]$b
 
 OP makes the given nickname, or yourself, a channel admin. You can only use
-this command if you're the founder of the channel.`,
+this command if you're a founder or in the AMODEs of the channel.`,
 			helpShort:    `$bOP$b makes the given user (or yourself) a channel admin.`,
 			authRequired: true,
 			enabled:      chanregEnabled,