doc: nft.8 add chain synopsis

The man page says this:

> {add | create} chain [family] table chain [ { {type} {hook} [device] {priority} } [policy] ]

But I suggest it should say this:

> {add | create} chain [family] table chain [ { {type} {hook} [device] {priority ;} [policy ;] } ]

i.e. the policy tuple should be inside the braces along with type, hook, device
& priority. Also the device & priority tuples each need to be followed by a
semicolon.

Signed-off-by: Duncan Roe <duncan_roe@optusnet.com.au>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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