migration-guide: add release notes for 4.0.21
(From yocto-docs rev: 2169a52a24ebd1906039c42632bae6c4285a3aca) Signed-off-by:Lee Chee Yang <chee.yang.lee@intel.com> Signed-off-by:
Alexandre Belloni <alexandre.belloni@bootlin.com> Signed-off-by:
Steve Sakoman <steve@sakoman.com>
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