Doc: replace Text type with Label type

Because the templates were changed.

Change-Id: Ib64f65d1735604ad0c54addc2c7d1ce850ca08a8
Reviewed-by: Alessandro Portale <alessandro.portale@digia.com>

doc/src/qtquick/creator-mobile-app-tutorial.qdoc

@@ -120,7 +120,7 @@
 
         \li Click \gui Design to open the file in \QMLD.
 
-        \li In the \gui Navigator pane, select \gui Text and press \key Delete
+        \li In the \gui Navigator pane, select \gui Label and press \key Delete
             to delete it.
 
         \li In the \gui Library view, \gui Resources tab, select Bluebubble.svg