[doc] Mention accelerated watchpoint conditions in the gdb manual

[Eli Zaretskii]

> From: Thiago Jung Bauermann <bauerman@br.ibm.com>
> Cc: gdb-patches@sourceware.org
> Date: Tue, 17 Aug 2010 17:19:43 -0300
> 
> > > +@smallexample
> > > +(@value{GDBP}) watch @var{ADDRESS|VARIABLE} if  @var{ADDRESS|VARIABLE} == @var{CONSTANT EXPRESSION}
> > > +@end smallexample
> > 
> > Please break the long line in two: it's too long and will overflow the
> > page boundary in the printed manual.
> 
> I had tested this on gdb.pdf and the generated line is shorter than the
> surrounding paragraphs.

It depends on the fonts used by TeX.  In general, any line in
@smallexample that is longer than 72 characters is unsafe.

> What about this version?

It's fine, thanks.