These variable descriptions were identical in the ref-manual.
I found out some reasoning behind that and added a bit of
explanation to the entries.
Reported-by: Robert P. J. Day <rpjday@crashcourse.ca>
(From yocto-docs rev: 5c786b5b62fefb959ed7c13bb83e718a9eb22189)
Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>