The description is clearly what effect the knob has when set, so the
additional text was unnecessary.
Reviewed by: jhb, se
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D29583
control over the result of buildworld and installworld; this especially
helps packaging systems such as nanobsd
Reviewed by: various (posted to arch)
MFC after: 1 month