Update doc on HPCS encryption keys for backups

[dishankkalra23]

Description

Update doc on HPCS encryption keys for backups

GE Issue - https://github.ibm.com/GoldenEye/issues/issues/9359

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[dishankkalra23]

/run pipeline

[imprateeksh]

LGTM

[shemau]

/run pipeline

[dishankkalra23]

This PR has been taken care in another PR - #221

Closing this PR