quincy: doc/rados: clean up ops/bluestore-migration.rst

[zdover23]

Clean up internal links, fix the numbering of a procedure, and implement Anthony D'Atri's suggestions in
#50487 and
#50488.

https://tracker.ceph.com/issues/58485

Signed-off-by: Zac Dover zac.dover@proton.me
(cherry picked from commit b28be76)

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