docs(tutorial): fix markup for tutorial_03.png diagram

Closes angular#3707

Author: twil

docs/content/tutorial/step_03.ngdoc

@@ -69,7 +69,7 @@ available as a filter input in the list repeater (`phone in phones | filter:`__`
 changes to the data model cause the repeater's input to change, the repeater efficiently updates
 the DOM to reflect the current state of the model.
 
-      <img  class="diagram" src="img/tutorial/tutorial_03.png">
+<img  class="diagram" src="img/tutorial/tutorial_03.png">
 
 * Use of the `filter` filter: The {@link api/ng.filter:filter filter} function uses the
 `query` value to create a new array that contains only those records that match the `query`.