Doc: import statements go to QML files, not pro files

Change-Id: Ia36ffd51add0c92b396e448d8e125848e9754877
Reviewed-by: Venugopal Shivashankar <venugopal.shivashankar@digia.com>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>

doc/src/qtquick/qtquick-designer.qdoc

@@ -156,7 +156,7 @@
     using Qt Quick 2.1. The Qt Quick Components and Controls are based on
     standard QML types. To view the components and controls in the
     \gui {Library} pane, add import
-    statements to the .pro file of your project. For example:
+    statements to the QML file in the \gui Edit mode. For example:
 
     \list