quincy: doc/cephfs: edit fs-volumes.rst (1 of x)

[zdover23]

Edit doc/cephfs/fs-volumes to the section "FS Subvolumes" (but not including the section "FS Subvolumes").

Signed-off-by: Zac Dover zac.dover@proton.me
(cherry picked from commit 0acbb27)

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[github-actions]

This pull request can no longer be automatically merged: a rebase is needed and changes have to be manually resolved