doc fix

common/python/nomadcore/nomad_query.py

@@ -157,6 +157,7 @@ class NomadQuery(object):
             username {str} -- Current username. Leave empty to auto-detect
                               username (default: {''})
             endpoint {str} -- Endpoint of the Nomad API (default:
+                              ${NOMAD_BASE_URI}/api if set, otherwise
                               {'https://analytics-toolkit.nomad-coe.eu/api/'})
         """
         self._username = ''