readme: fix dead link #2816

Job	Run time
openraft-test-bench (nightly)	54s
cluster-benchmark (cluster_benchmark)	45s
examples (stable, raft-kv-memstore)	2m 9s
external-stores (stores/rocksstore-v2)	5m 50s
examples (stable, raft-kv-rocksdb)	7m 44s
lint	6m 45s
examples (nightly, raft-kv-memstore)	2m 6s
examples (nightly, raft-kv-rocksdb)	11m 44s
openraft-feature-test (nightly)	50s
openraft-test (stable, 0)	2m 51s
openraft-feature-test (nightly, serde)	50s
openraft-test (nightly, 30)	3m 17s
openraft-feature-test (nightly, single-term-leader)	50s
stores (memstore)	46s
openraft-test (nightly, 0, single-term-leader)	2m 56s
openraft-feature-test (nightly, single-term-leader,serde,singlethreaded)	51s
stores (rocksstore)	6m 6s
stores (rocksstore-compat07)	6m 9s
Build (nightly, bench,serde,bt,singlethreaded)	48s
stores (sledstore)	53s
tests-feature-test (nightly)	2m 49s
tests-feature-test (nightly, single-term-leader)	2m 39s
tests-feature-test (nightly, loosen-follower-log-revert)	2m 44s
	1h 13m 16s

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