Fix warnings at 'make htmldocs', and formatting issues in the resulting
documentation.

- test.h: Fix annotation in kernel-doc parameter description.

- Documentation/*.rst: Fixing formatting issues, and a duplicate label
  issue due to usage of sphinx.ext.autosectionlabel and identical labels
  within one document (sphinx warning)
Signed-off-by: NLothar Rubusch <l.rubusch@gmail.com>
Reviewed-by: NBrendan Higgins <brendanhiggins@google.com>
Signed-off-by: NShuah Khan <skhan@linuxfoundation.org>