Update description of 'Other' modes in by travel mode modal

[johnclary]

Associated issues

• https://github.com/cityofaustin/atd-data-tech/issues/17102

Testing

• Netlify

Check out the text in the By Travel Mode popup:

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Ship list

• [ ] Check migrations for any conflicts with latest migrations in master branch
• [ ] Confirm Hasura role permissions for necessary access
• [ ] Code reviewed
• [ ] Product manager approved

[johnclary]

thanks, y'all!