Backport: docs: clarify requirements for deleting volumes (#26268) #21055

Job	Run time
checks / checks	1m 35s
compile (ubuntu-22.04)	3m 3s
tests-api	2m 31s
compile (windows-2019)	6s
tests-groups (command)	13m 10s
compile (macos-14)	6m 56s
tests-groups (nomad)	23m 5s
tests-groups (quick)	10m 5s
tests-groups (client)	15m 55s
tests-groups (drivers)	7m 33s
handle-failure / send-notification	6s
	1h 24m 5s

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