quincy: doc/rados: edit stretch-mode.rst

[zdover23]

Edit "Stretch Mode Limitations" (renamed "Limitations of Stretch Mode" in this commit) in doc/rados/operations/stretch-mode.rst.

Co-authored-by: Greg Farnum gfarnum@redhat.com
Co-authored-by: Anthony D'Atri anthony.datri@gmail.com
Signed-off-by: Zac Dover zac.dover@proton.me
(cherry picked from commit 410e2a1)

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