[pkg-netfilter-team] Bug#935858: nftables: lacks documentation

[westlake]

According to the nftables manpage,
"The inet address family is a dummy family which is used to create 
hybrid IPv4/IPv6 tables. When no address family is specified, ip is used 
by default."

considering a lot of users wanting to migrating from iptables to nft, 
would come across the issue that chain names need to be in capitals, ..

I believe I have scathed incorrectly on the usage of "ip" over "inet" .

inet can be used to set rules for both ipv4 and ipv6, but I haven't 
tested how well this works yet in this latest backports update.