Doc: QString::slice uses the wrong snippet

Changed the number, which caused the problem of showing the snippet.
Two of the same numbers were given to the different snippets.

Fixes: QTBUG-130565
Change-Id: Iba738a1bdaf5821df48bf5e222bee911c5ddf1fc
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>
(cherry picked from commit b3e5b134eeaae85025879cd0309664ce0ba1f6de)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

src/corelib/doc/snippets/qstring/main.cpp

@@ -912,11 +912,11 @@ void Widget::arrayOperator()
 
 void Widget::sliceFunction()
 {
-    //! [86]
+    //! [97]
     QString x = u"Nine pineapples"_s;
     x.slice(5);     // x == "pineapples"
     x.slice(4, 3);  // x == "app"
-    //! [86]
+    //! [97]
 }
 
 

src/corelib/text/qstring.cpp

@@ -5431,7 +5431,7 @@ QString QString::sliced_helper(QString &str, qsizetype pos, qsizetype n)
     \note The behavior is undefined if \a pos < 0, \a n < 0,
     or \a pos + \a n > size().
 
-    \snippet qstring/main.cpp 86
+    \snippet qstring/main.cpp 97
 
     \sa sliced(), first(), last(), chopped(), chop(), truncate()
 */