Also had to update four instances in the variables glossary where
links to the section for the class became misnamed due to
stripping out the excess stuff from the class section heading.
(From yocto-docs rev: d98d3848327950c5c5cfc8559379e56c97157ad2)
Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>