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. Update some URLs to latest
3. Remove unncessary "=="
Change-Id: Iff24e8d5082d8ef8dc2d29ea92288bf418f5500d
diff --git a/HACKING.rst b/HACKING.rst
index 7faf92f..befe517 100644
--- a/HACKING.rst
+++ b/HACKING.rst
@@ -1,5 +1,4 @@
Openstack Style Commandments
-
-===============================================
+============================
Read the OpenStack Style Commandments https://docs.openstack.org/hacking/latest/