Fixes [YOCTO #11630]
Moving the "Yocto Project Terms" section from the dev-manual to the
ref-manual broke several links to the id "build-directory". I fixed
these to reference into the ref-manual now.
(From yocto-docs rev: debe2ae8ce203ebe0f1cee0de54124c15df8bb7e)
Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>