[Email Routing] fix: code blocks in email routing changelog

[Cherry]

Summary

Fixes the code blocks so this renders correctly now:

(Note the Now when you run npx wrangler dev...` text being swallowed by the unclosed code block

Documentation checklist

• The documentation style guide has been adhered to.

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PR Change Summary

Fixed code block rendering issues in the email routing changelog documentation.

• Corrected unclosed code block in the changelog
• Ensured proper rendering of code snippets in documentation
• Updated local development instructions for email routing

Modified Files

• src/content/changelog/email-routing/2025-04-08-local-development.mdx

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