Update mta-sts.mdx

[kodster28]

Ugh, I failed you @cf-scott.

Follow up to #21181

[hyperlint-ai]

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PR Change Summary

Updated the code formatting in the mta-sts documentation for clarity.

• Changed code block language from 'index.js' to 'js' for better syntax highlighting.
• Modified the example code to enhance readability.

Modified Files

• src/content/docs/email-routing/setup/mta-sts.mdx

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[github-actions]

Preview URL: https://b30efa68.preview.developers.cloudflare.com
Preview Branch URL: https://kodster28-patch-54.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/email-routing/setup/mta-sts/	https://kodster28-patch-54.preview.developers.cloudflare.com/email-routing/setup/mta-sts/