[Cherry-pick]Add doc changes after rc1 to v1.12 docs#6814

Merged

Lyndon-Li merged 1 commit intovmware-tanzu:release-1.12from allenxu404:release-1.12

Sep 14, 2023

+425-18

Commits on Sep 13, 2023

Add doc changes after rc1 to v1.12 docs (vmware-tanzu#6812 )
allenxu404
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