(Modules): Fix references to completion modules.
Mark unidentified users on freenode and other servers supporting CAPAB.
@cindex modules, completion
-@item pcomplete
+@cindex modules, pcomplete
+@item completion (aka pcomplete)
Complete nicknames and commands (programmable)
@cindex modules, fill
Wrap long lines
@cindex modules, hecomplete
-@item completion
+@item hecomplete
Complete nicknames and commands (old). This is the old module---you
might prefer the ``completion'' module instead.