[PATCH] expand and clarify help for update

[Dirkjan Ochtman]

Matt Mackall wrote:
> So here's a simple proposal: add a -v switch to help topics to allow
> showing otherwise omitted sections of the help. Perhaps lines in help
> prefixed with '%' or some other character get removed without -v and
> displayed (without %) with -v.

I was thinking maybe we could insert a line with '---' on it and split 
on that. Having to insert a character on each line seems rather tedious.

Cheers,

Dirkjan