Revert some docs changes from multi-delete

The headers in the doc files are the commands, not a description.

I missed thiese in the original reviews:
https://review.openstack.org/140567
https://review.openstack.org/140581

Change-Id: Iae2631f6b485e8c568ff305e5992c193f80ebe71
Merge "Revert some docs changes from multi-delete"