Doc: faq: how to initalize a cluster #2854

Job	Run time
examples (stable, raft-kv-memstore)	2m 28s
cluster-benchmark (cluster_benchmark)	47s
examples (stable, raft-kv-rocksdb)	7m 54s
external-stores (stores/rocksstore-v2)	5m 47s
examples (nightly, raft-kv-memstore)	2m 12s
lint	6m 59s
examples (nightly, raft-kv-rocksdb)	12m 20s
openraft-feature-test (nightly)	50s
openraft-test (stable, 0)	2m 55s
openraft-feature-test (nightly, serde)	51s
openraft-test (nightly, 30)	3m 11s
openraft-feature-test (nightly, single-term-leader)	51s
openraft-test-bench (nightly)	54s
openraft-test (nightly, 0, single-term-leader)	2m 57s
openraft-feature-test (nightly, single-term-leader,serde,singlethreaded)	52s
stores (memstore)	53s
stores (rocksstore)	6m 1s
Build (nightly, bench,serde,bt,singlethreaded)	49s
stores (rocksstore-compat07)	6m 20s
tests-feature-test (nightly)	2m 42s
stores (sledstore)	57s
tests-feature-test (nightly, single-term-leader)	2m 41s
tests-feature-test (nightly, loosen-follower-log-revert)	2m 35s
	1h 14m 46s

Provide feedback