Update countries-where-sms-authentication-is-supported.md

[wyywwi]

Added "regions" to the list description for clarity. Kept the front matter unchanged to avoid potential unintended impacts.

Why:

The list description previously lacked "regions", which could lead to confusion for some users. To improve clarity and accuracy, "regions" was added to the description.

Closes:

What's being changed (if available, include any code snippets, screenshots, or gifs):

The term "country" was updated to "country or region" in the section titled Supported countries for SMS authentication. The title was also updated. The front matter was left unchanged to prevent potential unintended impacts on indexing and browsing.

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require a SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing.

[welcome]

Thanks for opening this pull request! A GitHub docs team member should be by to give feedback soon. In the meantime, please check out the contributing guidelines.

[github-actions]

Automatically generated comment ℹ️

This comment is automatically generated and will be overwritten every time changes are committed to this branch.

The table contains an overview of files in the content directory that have been changed in this pull request. It's provided to make it easy to review your changes on the staging site. Please note that changes to the data directory will not show up in this table.

---

Content directory changes

You may find it useful to copy this table into the pull request summary. There you can edit it to share links to important articles or changes and to give a high-level overview of how the changes in your pull request support the overall goals of the pull request.

Source	Preview	Production	What Changed
authentication/securing-your-account-with-two-factor-authentication-2fa/countries-where-sms-authentication-is-supported.md	fpt ghec	fpt ghec

---

fpt: Free, Pro, Team
ghec: GitHub Enterprise Cloud
ghes: GitHub Enterprise Server

[nguyenalex836]

@wyywwi Thanks so much for opening a PR! I'll get this triaged for review ✨

[jc-clark]

Looks great to me! Thanks @wyywwi for making this clearer for others ✨

I'll go ahead and merge.

[github-actions]

Thanks very much for contributing! Your pull request has been merged 🎉 You should see your changes appear on the site in approximately 24 hours. If you're looking for your next contribution, check out our help wanted issues ⚡