Doc: replace line numbers with snippets

Task-number: QTBUG-32109

Change-Id: Ifd34e0de579b1dfb1b08cf3d2646960d62f9d9eb
Reviewed-by: Sze Howe Koh <szehowe.koh@gmail.com>
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>
Update app icon docu from kde3 to both kde4 and kf5

Change-Id: I0dff98aec55b93245ba04f955a9c5f82ef784fe4
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@digia.com>
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Doc: fix link to Qt Creator Tutorials

In the Getting Started Programming with Qt Widgets topic.

Change-Id: Ia0979a3be062929f755f1d750455478e07814b6d
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>
Doc: Updated link to Qt Enterprise download page

Change-Id: I578506d868202d2c7eca9f1f678dbad5e8509d3c
Reviewed-by: hjk <hjk121@nokiamail.com>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>
Merge remote-tracking branch 'origin/stable' into dev

Change-Id: I85e26bb2a47f9ac7a9417d514dd696723f902082