Enhance .help resolving

[michaelortmann]

Found by: michaelortmann
Patch by: michaelortmann
Fixes:

One-line summary:
.help <module> fill now be resolved like it was .help <module> module

Additional description (if needed):

Test cases demonstrating functionality (if applicable):
Before:

.help irc
[19:21:20] tcl: builtin dcc call: *dcc:help -HQ 1 irc
[19:21:20] #-HQ# help irc
No help available on that.

After:

.help irc
[19:20:44] tcl: builtin dcc call: *dcc:help -HQ 1 irc
[19:20:44] #-HQ# help irc
###  irc module
   This module controls the bots interaction on IRC. It allows the bot to join
[...]