fix a typo

Author: chfw

.moban.d/docs/source/index.rst.jj2

@@ -316,7 +316,7 @@ Here are the sample embedding code:
 Those views can be accessed as http://localhost:8000/polls/embedded_handson_view/
 and http://localhost:8000/polls/embedded_handson_view_single/.
 
-.. image:: handsonable-embedded.png
+.. image:: handsontable-embedded.png
 
 {%endblock%}