Add 'Reverting to a Previous State' to Workspace / State Manipulation docs

[brandonc]

What

An upcoming state manipulation feature of the UI is described.

Screenshots

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Name	Status	Preview	Updated
terraform-docs-common	✅ Ready (Inspect)	Visit Preview	Dec 19, 2022 at 5:23PM (UTC)

[Uk1288]

This explanation was straight to the point and easy to understand. 🎉

[brandonc]

This is a beta feature and the docs should not be merged until it is generally available.