/usr/share/doc/hping3/examples/igrp.htcl is in hping3 3.a2.ds2-7.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | #hping send "ip(saddr=192.168.41.183,daddr=255.255.255.255,ttl=255)+igrp(opcode=update,edition=[expr 114+$i],autosys=1,interior=1,system=0,exterior=0)+igrp.entry(dest=$i.7.6)"
hping send "ip(saddr=192.168.41.183,daddr=192.168.41.184,ttl=255)+igrp(opcode=request,edition=100,autosys=1,interior=0,system=0,exterior=0)"
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