K 10
svn:author
V 6
emaste
K 8
svn:date
V 27
2020-12-30T01:14:58.111191Z
K 7
svn:log
V 300
Update GNU_DIFF knob descriptions

After r317209 the WITH_/WITHOUT_GNU_DIFF knob controls only diff3;
diff is always BSD diff.

MFC after:	1 week

(cherry picked from commit e578c8c3b51fdfa8dd4eafd113457d516d447984)

Git Hash:   696db1d8624f7491e9ada5b1b162ea70fe88aa98
Git Author: emaste@FreeBSD.org
END