feat: add Show Regions and update REGION_PEERS docs

[WenyXu]

What's Changed in this PR

close #1605

1. add Show Regions statement
2. update REGION_PEERS doc

Checklist

• Please confirm that all corresponding versions of the documents have been revised.
• Please ensure that the content in sidebars.ts matches the current document structure when you changed the document structure.
• This change requires follow-up update in localized docs.

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[fengjiachun]

LGTM

[killme2008]

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