freebsd-update(8): wrap to 80 columns

Reviewed by: imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/826

(cherry picked from commit 4c1c516c1a0760de2c86c073e8e74e297a71b088)
(cherry picked from commit e18ba5c5555a52e5603f0ce1f76b63f1ffe4b645)