remove tailscale from mod_md documentation

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1928039 13f79535-47bb-0310-9956-ffa450edef68

Author: icing

docs/manual/mod/mod_md.xml

@@ -285,44 +285,6 @@ MDChallengeDns01 /usr/bin/acme-setup-dns
             </p>
         </note>
 
-        <note><title>tailscale</title>
-            <p>
-                Since version 2.4.14 of the module, you can use it to get certificates
-                for your <a href="https://tailscale.com">tailscale</a> domains.
-            </p>
-            <highlight language="config">
-&lt;MDomain mydomain.some-thing.ts.net>
-  MDCertificateProtocol tailscale
-  MDCertificateAuthority file://localhost/var/run/tailscale/tailscaled.sock",
-&lt;/MDomain>
-            </highlight>
-            <p>
-                Tailscale provides secure networking between your machines, where ever
-                they are, and can provide domain names in the *.ts.net space for them.
-                For those, it will then provide Let's Encrypt certificates as well, so
-                you can open these domains in your browser securely.
-            </p>
-            <p>
-                The directives listed above tell Apache to contact the local tailscale
-                demon for obtaining and renewing certificates. This will only work for
-                the domain name that tailscale assigns to your machine.
-            </p>
-            <p>
-                Otherwise, these certificates work exactly like the ones retrieved
-                via the ACME protocol from Lets Encrypt. You see them in status reporting
-                and MDMessageCmd directives are executed for them as well.
-            </p>
-            <p>
-                More details are <a href="https://github.com/icing/mod_md#tailscale">
-                available at the mod_md github documentation</a>.
-            </p>
-            <p>
-                Note that this feature only works on machines where the tailscale
-                demon provides a unix domain socket. This, so far, seems only the
-                case on *nix systems.
-            </p>
-        </note>
-
     </summary>
 
     <directivesynopsis>