doc: nft.8 aim for consistent synopses throughout

Single items in braces have the braces removed as per wiki Scripting:
"It is simply overkill to define a set that only stores one single element".
Items that were in braces or square brackets are made consistent, e.g. {family}
expands to single wor Ip, inet &c., but (type) in set spec expands to
"type type_name ;".

Signed-off-by: Duncan Roe <duncan_roe@optusnet.com.au>
Signed-off-by: Florian Westphal <fw@strlen.de>

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