Add GitHub link to vertex mutation optimizations PR #5444

Job	Run time
build-all	3m 13s
build-java11	2m 44s
tests (core, 8)	1m 24s
tests (driver, 8)	1m 10s
tests (server, 8)	4m 0s
tests (test, 8)	6m 38s
tests (inmemory, -Dtest.skip.tp=false, 8)	32m 10s
tests (berkeleyje, 8)	9m 3s
tests (lucene, 8)	4m 53s
tests (core, -Pjava-11, 11)	1m 41s
tests (driver, -Pjava-11, 11)	1m 21s
tests (server, -Pjava-11, 11)	3m 48s
tests (test, -Pjava-11, 11)	6m 44s
tests (inmemory, -Pjava-11, -Dtest.skip.tp=false, 11)	32m 22s
tests (berkeleyje, -Pjava-11, 11)	9m 24s
tests (lucene, -Pjava-11, 11)	5m 6s
	2h 5m 41s

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