Updated about-mandatory-two-factor-authentication.md

[vishrutss]

Why:

Closes:
#34521

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

Periods removed from each list line in #about-eligibility-for-mandatory-2fa, as each line is not a complete sentence (per style guide)

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Source	Preview	Production	What Changed
authentication/securing-your-account-with-two-factor-authentication-2fa/about-mandatory-two-factor-authentication.md	fpt ghec	fpt ghec

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

[nguyenalex836]

@vishrutss Thank you so much for opening a PR with this fix! ✨ This repo is currently in a code freeze, but we will get this merged as soon as the freeze ends on 9/16 🍏 thanks again!

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