Update comment to include issue link

Issue link to discussion on backend changes that
should be implmeneted.

app/controllers/admin/application_settings_controller.rb

@@ -30,6 +30,7 @@ class Admin::ApplicationSettingsController < Admin::ApplicationController
   def integrations
     if Feature.enabled?(:instance_level_integrations)
       # TODO: Update this with actual integrations
+      # To be fixed with https://gitlab.com/gitlab-org/gitlab/-/issues/199388
       @integrations = Project.first&.find_or_initialize_services&.sort_by(&:title)
     end