This document was suggesting a way to version pre-releases
which doesn't match the latest recommendations from the
contributor guide.
(From yocto-docs rev: f37c9e7d44a2f7aefc3b505ae4461e6f1a8b0bb2)
Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>