chore(docs): mention rules_multirun (#681) #1558

Job	Run time
matrix-prep-os	1s
matrix-prep-bazelversion	5s
test (ubuntu-latest, 7.1.1, ., true)	32s
test (ubuntu-latest, 7.1.1, ., false)	5m 13s
test (ubuntu-latest, 7.1.1, e2e/wasm, false)	4m 14s
test (ubuntu-latest, 7.1.1, e2e/smoke, true)	14s
test (ubuntu-latest, 7.1.1, e2e/smoke, false)	2m 27s
test (ubuntu-latest, 7.1.1, e2e/assertion, true)	4m 38s
test (ubuntu-latest, 6.4.0, ., true)	2m 55s
test (ubuntu-latest, 6.4.0, ., false)	6m 10s
test (ubuntu-latest, 6.4.0, e2e/wasm, false)	2m 53s
test (ubuntu-latest, 6.4.0, e2e/smoke, true)	2m 25s
test (ubuntu-latest, 6.4.0, e2e/smoke, false)	18s
test (ubuntu-latest, 6.4.0, e2e/assertion, true)	4m 57s
test (macos-13, 7.1.1, ., true)	7m 53s
test (macos-13, 7.1.1, ., false)	4m 28s
test (macos-13, 7.1.1, e2e/smoke, true)	44s
test (macos-13, 7.1.1, e2e/smoke, false)	2m 55s
	53m 2s

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