quincy: doc/cephfs: edit fs-volumes.rst (2 of x)

[zdover23]

Edit doc/cephfs/fs-volumes to the section "Cloning Snapshots" (but not including the section "Cloning Snapshots".

Follows #57415

Signed-off-by: Zac Dover zac.dover@proton.me
(cherry picked from commit 0a3981a) (cherry picked from commit 08cf8fd)

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