Remove unnecessary page headings
Remove unnecessary page headings

Otherwise "Indices and tables" will appear in the list of documentation
on the main docs.opendaylight.org page.

Change-Id: Id2433e24c28e8d66dcf2be9a00c98567d61499da
Signed-off-by: Thanh Ha <09ea4d3a79c8bee41a16519f6a431f6bc0fd8d6f@linuxfoundation.org>

opendaylight/netvirt,opendaylight/netvirt,opendaylight/netvirt,opendaylight/netvirt,opendaylight/netvirt