Doc snippets: Use nullptr instead of 0 literal

Also mark constructors explicit, where applicable.

Fixes: QTBUG-84859
Change-Id: I145d366d854fd6b4373bcc23d0b880d6361d9014
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
(cherry picked from commit f3c402a6df0060dc4d0f3013c5d1fa31960dba7c)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/gui/doc/snippets/scribe-overview/main.cpp b/src/gui/doc/snippets/scribe-overview/main.cpp
index 6a0ff7a341..104dee2f53 100644
--- a/src/gui/doc/snippets/scribe-overview/main.cpp
+++ b/src/gui/doc/snippets/scribe-overview/main.cpp
@@ -68,7 +68,7 @@ void mergeFormat(QTextEdit *edit)
 
 int main(int argc, char *argv[])
 {
-    QWidget *parent = 0;
+    QWidget *parent = nullptr;
     QString aStringContainingHTMLtext("<h1>Scribe Overview</h1>");
 
     QApplication app(argc, argv);