doc: process: GPL -> GPL-compatible

Drivers under MIT, BSD-17-clause, or uncle-Bob's-newest-take-on-PD are
all fine, not just GPL.

Signed-off-by: Adam Borowski <kilobyte@angband.pl>
[jc: fixed conflict and refilled paragraph]
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

doc:process: remove note from 'stable api nonsense'

The link referred by the note can't be retrieved: this patch just
remove that old note.

Signed-off-by: Federico Vaga <federico.vaga@vaga.pv.it>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

docs-rst: add documents to development-process

Add several documents to the development-process ReST book.

As we don't want renames, use symlinks instead, keeping those
documents on their original place.

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>