TR-4446: update transmissions docs with new error code

[Emerson-Valentim]

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What Changed

• added a new error code for missing local part on email address.

How To Test or Verify

• rendered .md table.

Content Changes Checklist

• Check that your article looks correct in the preview here or in a Netlify deploy preview.
• Check the links in your article.
• Check the images in your article (if there are any)
• Check to make sure you are using markdown appropriately as outlined in examples/article.md in the root of the project directory and on the momentum doc's preface article
• Check to make sure the Copy and Tone Guidelines are followed.

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