Hints for knotes in xenial

knotes/4:15.12.3-0ubuntu1: org.kde.knotes.desktop ⚙ amd64 ⚙ armhf ⚙ i386 ⚙ s390x ⚙ arm64 ⚙ ppc64el ⚙ powerpc

metainfo-no-summary
Component does not contain a short summary. Ensure that the components metainfo file has a summary tag, or that its .desktop file has a Comment= field set. Especially applications by KDE often use the GenericName field for a short summary, instead of the Comment field (which is not its intended use case).
More information can be found in the Desktop Entry specification.