Update Sudo Mode documentation to include session timeout length

[adamrr724]

Code of Conduct

• [X] I have read and agree to the GitHub Docs project's Code of Conduct

What article on docs.github.com is affected?

https://docs.github.com/en/enterprise-cloud@latest/authentication/keeping-your-account-and-data-secure/sudo-mode

What part(s) of the article would you like to see updated?

Just need to update "a few hours" wording to explicitly state 2 hours session timeout.

Additional information

https://github.com/github/authnd/issues/1895#issuecomment-1516968032

[cmwilson21]

👋 @adamrr724 - Thank you for opening an issue and linking it to your PR! ✨

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