git: killall.1: Mention pkill(1)

[Aaron LI]

commit b7ff6841b245bed746660c49b3700227e1fdd155
Author: Aaron LI <aly at aaronly.me>
Date:   Fri Mar 12 09:26:05 2021 +0800

    killall.1: Mention pkill(1)
    
    While there, group the -h, -? and -help options together so it looks
    clearer.

Summary of changes:
 usr.bin/killall/killall.1 | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/b7ff6841b245bed746660c49b3700227e1fdd155


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