[rfa:doco] update for annotate level three

[Eli Zaretskii]

> Date: Fri, 16 May 2003 20:07:44 -0400
> From: Andrew Cagney <ac131313@redhat.com>
> 
> The attached updates GDB's annotation documentation to reflect
> annotation level three.
> 
> Ok?

I understand that we are removing level-2 annotations, and this docs
change is supposed to reflect that, right?

If so, I'd suggest to add a footnote that level-2 annotations were
once supported, but are now deprecated/removed.  Otherwise, naive
users might wonder what would --annotate=2 give them...

Otherwise, approved, thanks.