[RFC 2/6] Add "help news"

[Eli Zaretskii]

> Date: Sat, 04 Apr 2020 19:15:21 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: gdb-patches@sourceware.org
> 
> > From: Tom Tromey <tom@tromey.com>
> > Date: Sat,  4 Apr 2020 08:54:18 -0600
> > Cc: Tom Tromey <tom@tromey.com>
> > 
> > This adds a "help news" subcommand, which simply dumps the NEWS file.
> > The NEWS file is now installed.
> 
> Thanks.

Btw, I don't see this subcommand described in the manual.  Should it
be?