Fixed a typo

Author: synasius

docs/settings.rst

@@ -103,7 +103,7 @@ the ``cleartokens`` management command. Check :ref:`cleartokens` management comm
 
 ROTATE_REFRESH_TOKEN
 ~~~~~~~~~~~~~~~~~~~~
-When is set to `True` (default) a new refresh token is issued to the client when the client refresh an access token.
+When is set to `True` (default) a new refresh token is issued to the client when the client refreshes an access token.
 
 REQUEST_APPROVAL_PROMPT
 ~~~~~~~~~~~~~~~~~~~~~~~