D26918: Improve KNotification API docs

[Nicolas Fella]

nicolasfella added a task: T12709: Improvements for KNotifications documentation/guidelines.

REPOSITORY
  R289 KNotifications

REVISION DETAIL
  https://phabricator.kde.org/D26918

To: nicolasfella, #frameworks, broulik, jucato
Cc: apol, kde-frameworks-devel, LeGast00n, cblack, GB_2, michaelh, ngraham, bruns
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