[PATCH] expand and clarify help for update

[Alpár Jüttner]

> We go on to the command-line help:
> 
>     hg help status
> 
>     aliases: st
> 
>     show changed files in the working directory
> 
>         Show status of files in the repository. If names are given, only
>         files that match are shown. Files that are clean or ignored or
>         ....
>         See also http://www.selenic.com/mercurial/wiki/index.cgi/Update
> 

A lot of people prefers Mercurial over Subversion because it allows
off-line usage. Referring to an on-line wiki page is a step backwards
from that feature.

Regards,
Alpar