Doc: explain ReplicationSessionId in detail #4478

Job	Run time
Build (nightly, bench,serde,bt,singlethreaded)	53s
test-crate-tests (stable, 0)	3m 5s
test-crate-tests (nightly, 30)	3m 10s
cluster-benchmark (cluster_benchmark)	48s
test-crate-tests (nightly, 0, single-term-leader)	3m 4s
lint	3m 57s
openraft-feature-test (nightly)	55s
openraft-test-bench (nightly)	1m 4s
rt-monoio	41s
openraft-feature-test (nightly, serde)	52s
openraft-feature-test (nightly, serde,singlethreaded)	53s
stores (stores/memstore)	51s
test-crate-openraft (stable)	48s
test-crate-openraft (nightly)	51s
tests-feature-test (nightly)	3m 1s
tests-feature-test (nightly, single-term-leader)	2m 56s
examples (stable, memstore)	49s
examples (stable, rocksstore)	5m 35s
examples (stable, raft-kv-memstore)	2m 45s
examples (stable, raft-kv-memstore-grpc)	2m 16s
examples (stable, raft-kv-memstore-network-v2)	53s
examples (stable, raft-kv-memstore-opendal-snapshot-data)	1m 14s
examples (stable, raft-kv-memstore-singlethreaded)	53s
examples (stable, raft-kv-rocksdb)	7m 32s
examples (nightly, memstore)	55s
examples (nightly, rocksstore)	10m 18s
examples (nightly, raft-kv-memstore)	2m 24s
examples (nightly, raft-kv-memstore-grpc)	2m 0s
examples (nightly, raft-kv-memstore-network-v2)	1m 9s
examples (nightly, raft-kv-memstore-opendal-snapshot-data)	1m 27s
examples (nightly, raft-kv-memstore-singlethreaded)	1m 10s
examples (nightly, raft-kv-rocksdb)	11m 24s
	1h 20m 33s

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