doc: describe dynamic flag and caveats for packet-path updates

This fails:

nft add table ip filter
nft add chain ip filter input '{' type filter hook input priority 0 ';' '}'
nft add set ip filter protocols '{' type inet_proto ';' '}'
nft add rule ip filter input iifname lo set add ip protocol @protocols
                                                  ^^^^^^^^^^^^^^^^^^^
...as wrong set type gets chosen.
Describe dynamic flag and that sets should have both timeout and
max size set.

Signed-off-by: Florian Westphal <fw@strlen.de>

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