Add 'Clone Snapshot' API Documentation

[Reiyadowns]

Description

Adds documentation for the 'Clone Snapshot' API

Issues Resolved

Addresses half of issue #2111 (In combination with the branch 'add-cleanup-snapshot-docs', the issue is fully addressed and can be closed)

Version

Applies to all versions.

Checklist

• [x] By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and subject to the Developers Certificate of Origin. For more information on following Developer Certificate of Origin and signing off your commits, please check here.

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