Add Warning for Intranet Users

I was am using Authentik as a intranet only source of authentication. I went thru all the steps list here (including paying $99) and at the VERY end; the apple developer website tells you....Only public URIs are allowed and more than likely only valid TLDs, because mine is atypical.

There is a problem with the request entity

authentik.<domainname>.<non-standard TLD> - Domain not eligible

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