Doc: Add example explaining why `LogIOId` must be `(CommittedLeaderId… #302

Job	Run time
lint	12m 7s
cluster-benchmark (cluster_benchmark)	47s
openraft-feature-test (nightly)	58s
examples (stable, memstore)	39s
openraft-feature-test (nightly, serde)	56s
examples (stable, raft-kv-memstore)	2m 48s
openraft-test (stable, 0)	3m 37s
openraft-test-bench (nightly)	5m 9s
openraft-feature-test (nightly, single-term-leader)	54s
openraft-test (nightly, 30)	3m 33s
examples (stable, raft-kv-memstore-network-v2)	1m 2s
openraft-feature-test (nightly, single-term-leader,serde,singlethreaded)	54s
openraft-test (nightly, 0, single-term-leader)	3m 24s
examples (stable, raft-kv-memstore-opendal-snapshot-data)	1m 33s
examples (stable, raft-kv-memstore-singlethreaded)	1m 4s
stores (stores/memstore)	54s
examples (stable, raft-kv-rocksdb)	8m 7s
Build (nightly, bench,serde,bt,singlethreaded)	49s
stores (stores/rocksstore)	6m 15s
tests-feature-test (nightly)	3m 2s
examples (nightly, memstore)	53s
examples (nightly, raft-kv-memstore)	2m 11s
tests-feature-test (nightly, single-term-leader)	3m 5s
stores (stores/sledstore)	1m 10s
examples (nightly, raft-kv-memstore-network-v2)	1m 20s
tests-feature-test (nightly, loosen-follower-log-revert)	3m 4s
examples (nightly, raft-kv-memstore-opendal-snapshot-data)	2m 0s
examples (nightly, raft-kv-memstore-singlethreaded)	1m 20s
examples (nightly, raft-kv-rocksdb)	12m 50s
	1h 26m 25s

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