Fix the repeating titles
Fix the repeating titles

The Index page of reference guide[1] takes repeating titles,
All titles show up twice. This patch is to fix it.

[1] https://docs.openstack.org/oslo.vmware/latest/reference/index.html

Change-Id: I03f3bf6f37f9ac9038657cfc9ee98015f673caaf
Closes-Bug: #1735398

openstack/oslo.vmware