D29371: KMainWindow: remove doc paragraph about KGlobal::ref usage

[David Faure]

dfaure added a comment.


  `src/kmainwindow_p.h:59:    QEventLoopLocker locker;` so the refcounting effect is the same as documented, just with a different "backend".

REPOSITORY
  R263 KXmlGui

REVISION DETAIL
  https://phabricator.kde.org/D29371

To: dvratil, dfaure, #frameworks, davidedmundson
Cc: kde-frameworks-devel, LeGast00n, cblack, michaelh, ngraham, bruns
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