Fixes [YOCTO #4958]
Added a new section to start the Migration chapter. This
section will hold general migration issues that are not tied
to a specific release.
(From yocto-docs rev: e78ae7c64ae5fa7e7a5b1f804fb40b5690a4e899)
Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>