Silence some qdoc warnings

\internal needs to be on its own line, otherwise qdoc doesn't know what
\a means.

Pick-to: 6.5
Change-Id: Ie7bd2fd779540b8d7ea92f9d1dd94e73a771d2b6
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>

src/widgets/kernel/qwidget.cpp

@@ -7385,7 +7385,9 @@ QByteArray QWidget::saveGeometry() const
 }
 
 /*!
-   \internal Check a if \a restoredGeometry fits into \a availableGeometry
+   \internal
+
+   Check a if \a restoredGeometry fits into \a availableGeometry
    This method is used to verify that a widget is restored to a geometry, which
    fits into the target screen.