extensions: libxt_SNAT: rename IPv4 manpage and tell about IPv6 support

This patch renames libipt_SNAT.man to libxt_SNAT.man thus informing
about the IPv6 version.

Also the list of valid protocols for port mapping is updated to:
tcp, udp, dccp and sctp.

Signed-off-by: Mart Frauenlob <mart.frauenlob@chello.at>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
1 file changed