Fix format network dns doc
Fix format network dns doc

The code block on the srv name in the formatnetwork page is confusing
since the actual parameter is service. Moving the code block to the
service work makes it better.

Reviewed-by: Andrea Bolognani <3ada0bee826c753786fdbba72243dfba997094cf@redhat.com>
Signed-off-by: Cédric Bosdonnat <5de0be53dc3aabb89d8379dd21cea40e0795c9b1@suse.com>

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