Doc: Fix typo

Change-Id: Id10c4e4773340f4d9650561d4335f98485687483
Reviewed-by: Tim Jenssen <tim.jenssen@theqtcompany.com>

doc/src/qtquick/qtquick-ui-forms.qdoc

@@ -31,7 +31,7 @@
 
     \title Qt Quick UI Forms
 
-    You can use \QC wizards to create UI forms tha have the filename extension
+    You can use \QC wizards to create UI forms that have the filename extension
     \e .ui.qml. The UI forms contain a purely declarative subset of the QML
     language. It is recommended that you edit the forms in the \gui Design mode.
     \QC enforces the use of the supported QML features by displaying error