I added more detail about this directory. I stated that it
is the top-level build directory and it is set when you
initialize your build environment with one of the init scripts.
(From yocto-docs rev: 839d704e7096dba039b17e5989cad7314732e6db)
Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>