Fix some nits in system administration flavors
Fix some nits in system administration flavors

This patch addresses two nits:

1. vif I/O options should sit in 'Bandwidth I/O' rather than in 'Disk tuning'.
2. Last subsection is talking about 'project private flavor' not
   'instance VIF traffic control'. '

Change-Id: I302f2279194be71995b46a11ae45a5df6ba53b24

kairoaraujo/openstack-manuals,openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,Akasurde/openstack-manuals,gongysh2004/openstack-manual,potsmaster/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,Akasurde/openstack-manuals,openstack/openstack-manuals,saeki-masaki/openstack-manuals,kairoaraujo/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,saeki-masaki/openstack-manuals,potsmaster/openstack-manuals,gongysh2004/openstack-manual