Updated openstack/openstack
Project: openstack/oslo.config  a4bb2e4a1d53ae696a61056e25d4a9e31889cbd7

Add section titles and fix markup of docstring

Add section titles to the module docstring for cfg.py so
http://docs.openstack.org/developer/oslo.config/cfg.html is broken up
and easier to scan quickly.

Fix a couple of minor markup issues at the same time.

Change-Id: I03df6842b29e62de1b3c923218f174cf65fdefdb