Re: Fix asciidoc callouts in git man pages

> Started out just wanting to update the git-branch man page
> to include the "-r" option but noticed that the asciidoc
> callouts weren't being rendered in its man page.  Then
> noticed the same was true for all the man pages where
> they are used.
> 
> It turns out we've not been following the guidelines
> properly on how to use them.  The fact that they show up
> in a useful way in the html docs is really an accident.
> Even there they're not showing up as intended.
> 
> Unfortunately, even after all the docs are fixed up to use
> the proper format, they still don't render properly in the
> man format.   Seems this is a missing feature in the "xmlto"
> command.
> 
> The final patch in this series adds an xsl fragment which
> is passed to xmlto so that the callouts appear properly in
> the man pages.