Add direct link to edit the site

Signed-off-by: Michal Čihař <michal@cihar.com>

docs/admin/install.rst

@@ -443,9 +443,10 @@ Set correct site name
 Adjust site name in admin interface, otherwise links in RSS or registration
 emails will not work.
 
-You can do this under the :guilabel:`Sites › Sites`, change the 
-:guilabel:`Domain name` to match your setup. You might want to set
-:setting:`ENABLE_HTTPS` as well if you serve site over https.
+You can do this under the :guilabel:`Sites › Sites` (or directly open URL
+``/admin/sites/site/1/``), change the :guilabel:`Domain name` to match your
+setup. You might want to set :setting:`ENABLE_HTTPS` as well if you serve site
+over https.
 
 .. seealso:: :ref:`faq-site`