pacific: doc/rados: edit stretch-mode procedure

[zdover23]

Edit the "stretch mode" section in doc/rados/operations/stretch-mode.rst so that the procedure is formatted as a procedure and the sentences correctly have heads.

Co-authored-by: Anthony D'Atri anthony.datri@gmail.com
Signed-off-by: Zac Dover zac.dover@proton.me
(cherry picked from commit a19ff7a)

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