Sphinx complains about hardcoded links which can be replaced by an
extlink.
So let's apply its recommendations.
Cc: Quentin Schulz <foss+yocto@0leil.net>
(From yocto-docs rev: dc2ec13cfbe0f20a868108a0bd800c0a875c1796)
Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Reviewed-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>