git: traceroute.8: Mention ping6(8) and traceroute6(8)

[Aaron LI]

commit 7c8d170e3a048eba6b042d4d904949df4fbafb77
Author: Aaron LI <aly at aaronly.me>
Date:   Fri Jun 26 22:45:21 2020 +0800

    traceroute.8: Mention ping6(8) and traceroute6(8)

Summary of changes:
 usr.sbin/traceroute/traceroute.8 | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/7c8d170e3a048eba6b042d4d904949df4fbafb77


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