doc: remove mentions of NAT in ip6tables manpage

ip6tables does not support NAT at this time.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
diff --git a/ip6tables.8.in b/ip6tables.8.in
index 7142b4a..669a961 100644
--- a/ip6tables.8.in
+++ b/ip6tables.8.in
@@ -156,10 +156,8 @@
 \fB-L\fP, \fB--list\fP [\fIchain\fP]
 List all rules in the selected chain.  If no chain is selected, all
 chains are listed. Like every other ip6tables command, it applies to the
-specified table (filter is the default), so NAT rules get listed by
-.nf
- ip6tables -t nat -n -L
-.fi
+specified table (filter is the default).
+.IP ""
 Please note that it is often used with the \fB-n\fP
 option, in order to avoid long reverse DNS lookups.
 It is legal to specify the \fB-Z\fP
@@ -368,19 +366,6 @@
 The other main difference is that \fB-i\fP refers to the input interface;
 \fB-o\fP refers to the output interface, and both are available for packets
 entering the \fBFORWARD\fP chain.
-.\" .PP The various forms of NAT have been separated out; 
-.\" .B iptables 
-.\" is a pure packet filter when using the default `filter' table, with
-.\" optional extension modules.  This should simplify much of the previous
-.\" confusion over the combination of IP masquerading and packet filtering
-.\" seen previously.  So the following options are handled differently:
-.\" .br
-.\" -j MASQ
-.\" .br
-.\" -M -S
-.\" .br
-.\" -M -L
-.\" .br
 There are several other changes in ip6tables.
 .SH SEE ALSO
 .BR ip6tables-save (8),
@@ -391,7 +376,7 @@
 .BR libipq (3).
 .P
 The packet-filtering-HOWTO details iptables usage for
-packet filtering, the NAT-HOWTO details NAT,
+packet filtering,
 the netfilter-extensions-HOWTO details the extensions that are
 not in the standard distribution,
 and the netfilter-hacking-HOWTO details the netfilter internals.