doc: cut v4.12.1 release#986

andyzhangx wants to merge 2 commits intokubernetes-csi:release-4.12kubernetes-csi/csi-driver-nfs:release-4.12from

andyzhangx:cut-v4.12.1-2andyzhangx/csi-driver-nfs:cut-v4.12.1-2Copy head branch name to clipboard