a comma too much (#8771)

Signed-off-by: Chagai Friedlander <chagai95@gmail.com>

changelog.d/8771.doc

+Remove extraneous comma from JSON example in User Admin API docs.
\ No newline at end of file

docs/admin_api/user_admin_api.rst

@@ -254,7 +254,7 @@ with a body of:
 
    {
        "new_password": "<secret>",
-       "logout_devices": true,
+       "logout_devices": true
    }
 
 To use it, you will need to authenticate by providing an ``access_token`` for a