Fix include order to respect the Coding Conventions. Remove QT_{BEGIN,END}_NAMESPACE because these are private Qt macros that should not be used in the examples. Task-number: QTBUG-117146 Pick-to: 6.5 Change-Id: Iba7a4726180ec97d9654ed3b934baca8c1df0b5c Reviewed-by: Ivan Solovev <ivan.solovev@qt.io> (cherry picked from commit 00d8d566c65209130cce2c2cb710bebc4beaf438) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
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