git: xargs.1: Add some words about -r (taken from FreeBSD).

[Sascha Wildner]

commit 7c1d4c2ca6b8ca4effa629677ccc4c2e876a005f
Author: Sascha Wildner <saw at online.de>
Date:   Wed Mar 1 22:05:27 2017 +0100

    xargs.1: Add some words about -r (taken from FreeBSD).

Summary of changes:
 usr.bin/xargs/xargs.1 | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/7c1d4c2ca6b8ca4effa629677ccc4c2e876a005f


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