Fix GHES docs for PAT as SSO not available

[amarvin]

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?

content/authentication/keeping-your-account-and-data-secure/managing-your-personal-access-tokens.md

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

Personal access tokens (PATs) screenshot shows "configure SSO" even for GitHub Enterprise Server (GHES), but GHES doesn't have SSO for PATs.

Additional information

No response