Add further TOTP examples

[bkmgit]

Why:

#11603

What's being changed:

Add links to further TOTP options

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• I have reviewed my changes in staging (look for "Automatically generated comment" and click Modified to view your latest changes).
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Writer impact (This section is for GitHub staff members only):

• This pull request impacts the contribution experience
  • I have added the 'writer impact' label
  • I have added a description and/or a video demo of the changes below (e.g. a "before and after video")

[github-actions]

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Content directory changes

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Source	Staging	Production	What Changed
content/authentication/securing-your-account-with-two-factor-authentication-2fa/configuring-two-factor-authentication.md	Modified	Original

[ramyaparimi]

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

[lecoursen]

Thanks for you interest in our docs @bkmgit! This list of recommendations is maintained by our security team, and we don't accept outside additions. Let me know if you have any questions about that!

[bkmgit]

@lecoursen Thanks for your review. Will any of the options be considered? Given that TOTP is an open protocol, it is surprising that this is not mentioned in the documentation and only a few proprietary TOTP options have been given.

[lee-dohm]

@bkmgit We take our customers' security very seriously. Our security team chooses a short list of apps that they are supremely confident in for these purposes. And, while we don't explicitly state that there are other options, it is implied in the existing documentation.