Add a note that the use of -B option does not guarantee a size of fragment
if -z option also used.
Recommend the use of zip(1) if compressed files of predictable size needed.
Submitted by: Sevan Janiyan
Reported by: firstname.lastname@example.org
While here, pet igor
Reviewed by: bcr
Differential Revision: https://reviews.freebsd.org/D18686