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FFS/UFS snapshots: improve documentation for removal (deletion) and unlinking.

Description

FFS/UFS snapshots: improve documentation for removal (deletion) and unlinking.

Clarification of the size of the snapshot file.

Suggested by: Matteo Riondato
PR: 266358
Differential Revision: https://reviews.freebsd.org/D38817

(cherry picked from commit 129ea078cd16b768a1100b497282fd9359e8dfea)