Doc: fix a typo

'desigm' should be 'design'

Change-Id: I885a5082c0517cca8e3f6cbe7ca40383ddee0cff
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>

doc/src/projects/creator-projects-creating.qdoc

@@ -136,7 +136,7 @@
 
             \o  HTML5 Application
 
-                Use a QtWebKit view to desigm the user interface and HTML5 and
+                Use a QtWebKit view to design the user interface and HTML5 and
                 C++ code to implement the application logic
 
             \o  Qt Quick UI