Fix typo in examples/editor (#2350)

* Small typo prevented Markdown Editor example from working

Author: oliveradria

editor/index.html

@@ -28,7 +28,7 @@
 	view: function() {
 		return [
 			m("textarea.input", {
-				oninput: function (e) { state.update(e.traget.value) },
+				oninput: function (e) { state.update(e.target.value) },
 				value: state.text
 			}),
 			m(".preview", m.trust(marked(state.text))),