Fix missing reference and styling issues found thanks
to trailing dots (only non black character in a line)
Matches (and multiple false positives) found with the below command:
git grep "\s\.$"
(From yocto-docs rev: 1d3026f50753d9ccf39b7d0163c77c765d754994)
Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>