Sphinx complains about hardcoded links which can be replaced by an
extlink.
So let's apply its recommendations.
Reported-by: Quentin Schulz <foss+yocto@0leil.net>
(From yocto-docs rev: 47a04ba13d55bd92d18b861e32cf4dba1bf70f84)
Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>