D26317: Port endl to "\n". endl in qt5.15 is namespaced. We don't need to flush as when QFile is deleted it flush data

[Laurent Montel]

mlaurent added a reviewer: dfaure.

REPOSITORY
  R238 KDocTools

REVISION DETAIL
  https://phabricator.kde.org/D26317

To: mlaurent, dfaure
Cc: kde-frameworks-devel, kde-doc-english, LeGast00n, gennad, fbampaloukas, 
GB_2, michaelh, ngraham, bruns, skadinna