Docs: add an example for custom domain input
Closes
@@ -21,7 +21,7 @@ To setup your custom domain, follow these steps:
#. Go the :guilabel:`Admin` tab of your project.
#. Click on :guilabel:`Domains`.
-#. Enter your domain.
+#. Enter the domain where you want to serve the documentation from (e.g. ``docs.example.com``).
#. Mark the :guilabel:`Canonical` option if you want use this domain
as your :doc:`canonical domain </canonical-urls>`.
#. Click on :guilabel:`Add`.
