Add docs about zone based podAntiAffinity rules #2102

Job	Run time
Build manager image	24s
gitleaks	4s
Dispatch unit test / Check whether unit test & lint should run based on the changed files	7s
Dispatch verify-commit-pins / Ensure SHA pinned actions	5s
Dispatch unit test / Lint	2m 14s
Dispatch unit test / Run unit tests	2m 35s
Dispatch unit test / Run unit tests with experimental build tag	1m 46s
Dispatch UI tests / Run UI tests	10m 6s
Dispatch integration tests / Check whether integration tests should run based on the changed files	7s
Dispatch integration tests / Istio upgrade integration test	0s
Dispatch integration tests / Istio integration test evaluation	0s
Dispatch integration tests / Kubernetes version compatibility test	0s
Dispatch integration tests / Istio integration test	0s
pull-request-status	1s
	17m 29s

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