Changed a tiny grammatical error

Erik Sjöström · Erik Sjöström · commit 612ae26958f4 · 2014-05-29T00:13:55.000+02:00
diff --git a/docs/source/example_helloworld.rst b/docs/source/example_helloworld.rst
@@ -43,7 +43,7 @@ Let's create a simple Hello world application, with one Label and one Button.
     class HelloWorldScreen(GridLayout):
         counter = NumericProperty(0)
         def my_callback(self):
-            print 'The button have been pushed'
+            print 'The button has been pushed'
             self.counter += 1
 
     class HelloWorldApp(App):
