domains: make the certs setup more descriptive

src/js/setupdns.js

@@ -24,7 +24,7 @@ app.controller('SetupDNSController', ['$scope', '$http', '$timeout', 'Client', f
     $scope.tlsProvider = [
         { name: 'Let\'s Encrypt Prod', value: 'letsencrypt-prod' },
         { name: 'Let\'s Encrypt Staging', value: 'letsencrypt-staging' },
-        { name: 'Self-Signed', value: 'fallback' },
+        { name: 'Self-Signed', value: 'fallback' }, // this is not 'Custom' because we don't allow user to upload certs during setup phase
     ];
 
     // If we migrate the api origin we have to poll the new location