[PATCH v2] Improve ptrace-error detection on Linux targets

[Eli Zaretskii]

> From: Sergio Durigan Junior <sergiodj@redhat.com>
> Cc: Pedro Alves <palves@redhat.com>,
> 	Eli Zaretskii <eliz@gnu.org>,
> 	Ruslan Kabatsayev <b7.10110111@gmail.com>,
> 	Sergio Durigan Junior <sergiodj@redhat.com>
> Date: Mon, 26 Aug 2019 14:32:05 -0400
> 
> gdb/doc/ChangeLog:
> yyyy-mm-dd  Sergio Durigan Junior  <sergiodj@redhat.com>
> 
> 	* gdb.texinfo (Linux kernel ptrace restrictions): New appendix
> 	section.

OK for this part.

Thanks.