Fix typo in Rst format

Author: JonathanHuot

HISTORY.rst

@@ -8,7 +8,7 @@ v1.3.2 (TBD)
   <https://github.com/requests/requests-oauthlib/issues/404>`_.
 - ``OAuth2Session`` constructor now uses its ``client.scope`` when a ``client``
   is provided and ``scope`` is not overridden. Fixes `#408
-<https://github.com/requests/requests-oauthlib/issues/408>`_
+  <https://github.com/requests/requests-oauthlib/issues/408>`_
 
 v1.3.1 (21 January 2022)
 ++++++++++++++++++++++++