Added the DISTRO_EXTRAS_RDEPENDS variable to the glossary and
updated the DISTRO_EXTRAS_RRECOMMENDS variable per Paul
Eggleton's review.
(From yocto-docs rev: bb27fcb3b990bb335176d5da9fec420fdc31bf22)
Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>