man page: remove forward slash (#75)

Author: mcpcpc

kirc.1

@@ -66,7 +66,7 @@ Set default message channel to <channel>
 .BI <message>
 Send PRIVMSG to default message channel with <message> as the content
 .TP
-.BI /@<channel|nick>
+.BI @<channel|nick>
 Send PRIVMSG to specified <channel> or <nick>
 .SH AUTHOR
 Michael Czigler <michaelczigler at icloud dot com>