Update docs/install/containers/examples/traefik-volto-plone-varnish.md

Co-authored-by: Steve Piercy <web@stevepiercy.com>

Author: polyester

docs/install/containers/examples/traefik-volto-plone-varnish.md

@@ -404,7 +404,7 @@ services:
       - db
 #   If the Docker container is run with a UID other than the UID which owns the local file system persistent storage,
 #   explicitly make the container run with the correct UID. For example, `user: 1000:1000`.
-#   In that case make sure also the 'db' service gets the same 'user: 1000:1000' configuration,
+#   In that case, also make sure that the `db` service gets the same `user: 1000:1000` configuration,
 #   as they both need access to the filesystem