docs: remove reference to non-existent "igmp-ipv6" protocol
IGMP is used on IPv4 networks tp setup multicast group memberships. On
IPv6, this job is done by Multicast Listener Discovery (MLD), which
uses ICMPv6 packets rather than its own IP protocol number like IGMP.
The nwfilter documentation lists "igmp-ipv6" as one of the possible
protocols, but this is ignored (and stripped from the xml). This patch
removes that erroneous reference.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=
1038888
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