docs: update how to disable unathenticated sign-ups

[balcsok]

Why: Docs out of date

Closes: n/a

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

Since the Enable sign-up button is no longer present in the Management Console UI, I propose to change the wording of the doc to say "Make sure to select Private mode"

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• I have reviewed my changes in staging, available via the View deployment link in this PR's timeline (this link will be available after opening the PR).

  • For content changes, you will also see an automatically generated comment with links directly to pages you've modified. The comment won't appear if your PR only edits files in the data directory.

• For content changes, I have completed the self-review checklist.

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Content directory changes

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Source	Preview	Production	What Changed
admin/managing-iam/using-built-in-authentication/disabling-unauthenticated-sign-ups.md	ghes@ 3.14 3.13 3.12 3.11 3.10	ghes@ 3.14 3.13 3.12 3.11 3.10

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

[nguyenalex836]

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

[sophietheking]

@balcsok 👋 Thanks for opening this PR and contributing to our docs, we really appreciate it!

The Enable sign-up option is visible on my GHES 3.14 instance (if you scroll down a little):

What version of GHES are you on? 😄

[balcsok]

Hi there! Thanks for checking. I'm on 3.14.0 - just updated recently.

I don't see the button, maybe it's missing due to a configuration? FWIW, I'm using SSO (MS Entra).
Including a screenshot, where I scrolled further, just to prove it's not there (for me, at least 😄):

[sophietheking]

@balcsok Ahh, right. From the article, it looks like you can only disable authenticated sign-ups if you're using built-in authentication for your GHES instance, so that would explain the missing option in your Management Console. 😸

[nguyenalex836]

@sophietheking Thank you for reviewing here! ✨

@balcsok Given the conversation above, I'll go ahead and close this issue 💛

If by chance you're looking for issues to pick up, take a look at our help wanted section to find open issues you can work on ✨