skip-localities-check: Document caveats/recommendations for RESTORing with different regions

[Xiang-Gu]

Xiang Gu (Xiang-Gu) commented:

There are some caveats when restoring into a cluster with different regions, especially when the backup is taken with primary region set to the old region. Essentially, the problems and workaround we encountered and proposed in this escalation ticket should be documented under this doc section.

Jira Issue: DOC-9120