[miniflare] Update sending.mdx to account for new email logging location.

[tpmmorris]

Added new location (.wrangler/tmp/email/...) for email logging to the local testing example output.

Summary

Email logging was in an inconvenient location so an additional location has been added in .wrangler/tmp/email/<session-uuid>/email-text/<message-uuid>. When emails are sent by a worker, this new location is logged after 'Text (local)' and this change should be reflected in the documentation. Changelog entry added to src/content/email-service/.

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]

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✅ No issues found in commit 38e1683.

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