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

[David Edmundson]

davidedmundson accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R263 KXmlGui

BRANCH
  master

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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