Fix version in which SH_Table_AlwaysDrawLeftTopGridLines was added

Since it shows up as a new enum value in the 6.3 header review, it's
reasonable to assume that it was added for 6.3.

Pick-to: 6.3
Change-Id: If766ef56f3354644fbda09088514e55b28a44f32
Reviewed-by: Andy Shaw <andy.shaw@qt.io>

src/widgets/styles/qstyle.cpp

@@ -2018,7 +2018,7 @@ void QStyle::drawItemPixmap(QPainter *painter, const QRect &rect, int alignment,
     \value SH_Table_AlwaysDrawLeftTopGridLines
            Determines if the far left and top grid lines are drawn in a table or
            not when the header is hidden. Defaults to false.
-           This enum value has been introduced in Qt 6.2.
+           This enum value has been introduced in Qt 6.3.
 
     \sa styleHint()
 */