[Docs RFC] Update restore point info to include `create_distributed_restore_point`

[Loquacity]

Describe change in content, appearance, or functionality

The Limitations section doesn't mention to use create_distributed_restore_point with access nodes.

Current:

A consistent restore point for backup/restore across nodes is not natively provided; care must be taken when restoring individual backups to access and data nodes.

Add:

remember to use create_distributed_restore_point

Subject matter expert (SME)

@noctarius

Deadline

[When does this need to be addressed]

Any further info

Link to Community Slack thread

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