Remove the exception description of auth_version in doc
After I2601433585740030ab61433f0e8ca1a919275d9f is merged,
the exception description of auth_version is no longer
true, this is to remove it.
Change-Id: I5f9d8fb852faa92708158fca7d7bc7f5ac2fd933
diff --git a/doc/source/configuration.rst b/doc/source/configuration.rst
index 2314222..4accd94 100644
--- a/doc/source/configuration.rst
+++ b/doc/source/configuration.rst
@@ -52,8 +52,7 @@
#. ``uri_v3``
The ``auth_version`` option is used to tell Tempest whether it should be using
-keystone's v2 or v3 api for communicating with keystone. (except for the
-identity api tests which will test a specific version) The two uri options are
+keystone's v2 or v3 api for communicating with keystone. The two uri options are
used to tell Tempest the url of the keystone endpoint. The ``uri`` option is
used for keystone v2 request and ``uri_v3`` is used for keystone v3. You want to
ensure that which ever version you set for ``auth_version`` has its uri option