docs: clarify rules_docker replacement belief (#467) #1093

Job	Run time
matrix-prep-bazelversion	3s
matrix-prep-os	1s
test (ubuntu-latest, 6.2.0, ., true)	2m 10s
test (ubuntu-latest, 6.2.0, ., false)	1m 45s
test (ubuntu-latest, 6.2.0, e2e/custom_registry, false)	22s
test (ubuntu-latest, 6.2.0, e2e/wasm, false)	1m 58s
test (ubuntu-latest, 6.2.0, e2e/smoke, true)	1m 30s
test (ubuntu-latest, 6.2.0, e2e/smoke, false)	1m 58s
test (ubuntu-latest, 6.2.0, e2e/crane_as_registry, true)	59s
test (ubuntu-latest, 6.2.0, e2e/crane_as_registry, false)	1m 3s
test (ubuntu-latest, 6.2.0, e2e/pull, true)	1m 10s
test (ubuntu-latest, 5.3.2, ., false)	1m 42s
test (ubuntu-latest, 5.3.2, e2e/custom_registry, false)	22s
test (ubuntu-latest, 5.3.2, e2e/wasm, false)	3m 44s
test (ubuntu-latest, 5.3.2, e2e/smoke, false)	2m 55s
test (ubuntu-latest, 5.3.2, e2e/crane_as_registry, false)	2m 55s
test (macos-latest, 6.2.0, ., true)	4m 52s
test (macos-latest, 6.2.0, ., false)	3m 51s
test (macos-latest, 6.2.0, e2e/smoke, true)	36s
test (macos-latest, 6.2.0, e2e/smoke, false)	41s
	34m 37s

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