[Email Service] Document Local Explorer email views

[tpmmorris]

Summary

Add documentation for the email group added to the local explorer.

Documentation checklist

• Is there a changelog entry (guidelines)? If you don't add one for something awesome and new (however small) — how will our customers find out? Changelogs are automatically posted to RSS feeds, the Discord, and X.
• The change adheres to the documentation style guide.

[cloudflare-docs-bot]

Review

⚠️ Part of the review could not complete in commit 066c3d0 — it will retry on the next push.

Code Review

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_{No code review issues found.}

Conventions

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Style Guide Review

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Command	Description
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/rebase	Rebases the PR branch against production. On conflict, attempts to resolve automatically using AI. Stops with an explanation if confidence is not high enough.

[irvinebroque]

@tpmmorris try using CleanShot X for screenshots

[irvinebroque]

does this still need to get merged?

[tpmmorris]

@irvinebroque It does still need merging, so I'll rebase, but before pushing: as far as I can tell I don't have access to Cleanshot X as an intern, is there any promoted alternative?