quick_ frontend (quick widgets): added explanation in docstring for non special keywords in getOrCreateWidget

frontends/src/quick_frontend/quick_widgets.py

@@ -112,6 +112,8 @@ class QuickWidgetsManager(object):
                 C.WIDGET_RAISE: raise WidgetAlreadyExistsError
                 C.WIDGET_RECREATE: create a new widget *WITH A NEW HASH*
             if 'force_hash' is present, the hash given in value will be used instead of the one returned by class_.getWidgetHash
+            other keys will be used to instanciate class_ if the case happen (e.g. if type_ is present and class_ is a QuickChat subclass,
+                it will be used to create a new QuickChat instance).
         @return: a class_ instance, either new or already existing
         """
         cls = self.getRealClass(class_)