Doc update for Persistent Volumes

[deepakkinni]

This PR is a doc update explaining the change in behavior described in the KEP https://github.com/kubernetes/enhancements/tree/master/keps/sig-storage/2644-honor-pv-reclaim-policy

cc: @xing-yang @jsafrane @carlory

KEP: kubernetes/enhancements#2644

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[tengqm]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: ec392419fa821f615fffae897f0d2d7a28be59bf

[Arhell]

lgtm

[Princesso]

/approve

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