Update providers_default_disable

[eyalkraft]

Update docs following elastic/elastic-agent#4166

[github-actions]

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[mergify]

This pull request does not have a backport label. Could you fix it @eyalkraft? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-/d./d is the label to automatically backport to the /d./d branch. /d is the digit
  NOTE: backport-skip has been added to this pull request.

[kilfoyle]

Thanks a lot @eyalkraft. This looks great!
I'll just wait for the associated code PR merge before merging this one.

[eyalkraft]

Thanks @kilfoyle! I think we're ready

[kilfoyle]

Perfect. Thanks again @eyalkraft and welcome to this repo! :-)