docs: QoS parameter 'floor' is supported for 'open' networks too
docs: QoS parameter 'floor' is supported for 'open' networks too

Relevant code seems to treat forward modes 'route', 'nat', 'open' and 'none'
the same but documentation hasn't reflected that so far.

Signed-off-by: Pavel Mores <e8e79a41a9b826cd47122238a26f8527b5f610bc@redhat.com>
Reviewed-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

nertpinx/libvirt,crobinso/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,crobinso/libvirt,libvirt/libvirt,zippy2/libvirt,jardasgit/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,zippy2/libvirt,olafhering/libvirt,zippy2/libvirt,olafhering/libvirt,libvirt/libvirt,olafhering/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,zippy2/libvirt,jardasgit/libvirt,crobinso/libvirt,jfehlig/libvirt,libvirt/libvirt,jfehlig/libvirt,nertpinx/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,libvirt/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,olafhering/libvirt,jfehlig/libvirt,crobinso/libvirt