migration-guide: add release notes for 4.0.22
(From yocto-docs rev: 9563855ccd92e21fb6f8320c96a3a83e115c947e)
Signed-off-by: Lee Chee Yang <chee.yang.lee@intel.com>
Reviewed-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>