ArcGIS docs: rephrase auth_domain parameter doc
@@ -86,7 +86,8 @@ class ArcGIS(Geocoder):
.. versionadded:: 1.14.0
:param str auth_domain: Domain where the target ArcGIS auth service
- is hosted. Required if authenticated mode is desired.
+ is hosted. Used only in authenticated mode (i.e. username,
+ password and referer are set).
.. versionadded:: 1.17.0
