update doc for persistenceStoragePath (#1510) #1643

Job	Run time
Build Reaper	6m 3s
Memory backends (binary:3.0.25, local, ccm)	17m 20s
HTTP Management (binary:4.0.6, ccm, http-api, 1, 1)	23m 7s
Docker Image Tests (cassandra, docker)	7m 25s
Memory backends (binary:3.11.16, local, ccm)	19m 44s
Cassandra backend (binary:3.0.25, cassandra, ccm)	18m 32s
HTTP Management (binary:3.11.16, ccm, http-api, 1, 1)	22m 43s
Memory backends (binary:4.0.6, local, ccm)	22m 24s
Cassandra backend (binary:3.11.16, cassandra, ccm)	22m 29s
Cassandra backend (binary:4.0.6, cassandra, ccm)	23m 12s
Flapping reapers (binary:4.0.6, cassandra, ccm, 4, 2, --tags ~@diag_event_subscriptions)	25m 15s
Distributed tests (binary:3.0.25, cassandra, ccm, 2, 2)	20m 28s
Each DC Availability (binary:4.0.6, cassandra, each, 1, 1)	21m 58s
Distributed tests (binary:3.11.16, cassandra, ccm, 2, 2)	23m 0s
Sidecar (binary:3.0.25, cassandra, sidecar, 1, 1)	16m 22s
Distributed tests (binary:4.0.6, cassandra, ccm, 2, 2)	27m 54s
Sidecar (binary:3.11.16, cassandra, sidecar, 1, 1)	16m 36s
Sidecar (binary:4.0.6, cassandra, sidecar, 1, 1)	19m 25s
Release Reaper	6m 17s
	6h 0m 14s

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