git: Fix remaining references to mkinitrd.8 to initrd.7

[Aaron LI]

commit f897b3792373c08ace5e5fa26c496bb9008d659e
Author: Aaron LI <aly at aaronly.me>
Date:   Fri Jul 6 14:39:44 2018 +0800

    Fix remaining references to mkinitrd.8 to initrd.7
    
    Reported-by: swildner

Summary of changes:
 sys/boot/common/help.common | 2 +-
 sys/boot/common/loader.8    | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/f897b3792373c08ace5e5fa26c496bb9008d659e


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