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

@@ -405,7 +405,7 @@ services:
 #   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, also make sure that the `db` service gets the same `user: 1000:1000` configuration,
-#   as they both need access to the filesystem
+#   as they both need access to the file system.
 
 
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