JDK13+ is much stricter about what is considered valid Javadoc. Fixup
to make compilation pass on JDK17. This breaks linting on JDK11, hence
we also disable it for now.
Change-Id: I4ee650e13a135349c9522ad74fe098f088c09e5d Signed-off-by: Robert Varga <robert.varga@pantheon.tech>