Fixed two warnings:
- keystonemiddleware/auth_token/__init__.py:docstring of
keystonemiddleware.auth_token.BaseAuthProtocol.kwargs_to_fetch_token
WARNING: Inline strong start-string without end-string.
- keystonemiddleware/doc/source/api/modules.rst
WARNING: document isn't included in any toctree
Change-Id: Iaec9adb228fe9131365ab1c15d4c85567921ccdd