Sync Sphinx requirement
1. Sync sphinx dependency with global requirements. It caps python 2 since
sphinx 2.0 no longer supports Python 2.7.
2. Remove unncessary "=="
Change-Id: Id733fe1f513e756eb7bb2e8314bdb5dacc5dacd3
diff --git a/releasenotes/source/index.rst b/releasenotes/source/index.rst
index 5648f19..7486090 100644
--- a/releasenotes/source/index.rst
+++ b/releasenotes/source/index.rst
@@ -1,6 +1,6 @@
-======================================
- Neutron Tempest Plugin Release Notes
-======================================
+====================================
+Neutron Tempest Plugin Release Notes
+====================================
.. toctree::
:maxdepth: 1