Managed repository template path expansions

Documents managed repository template path expansion terms, accompanying https://github.com/openmicroscopy/openmicroscopy/pull/2701. These changes are staged at http://www.openmicroscopy.org/site/support/omero5-staging/sysadmins/fs-upload-configuration.html.
IIUC you're talking about real filesystem paths (which will be owned by the omero system user) but referring to omero users as owning the files/dirs. Is it worth making this clearer in this section?