doc: fix method handler access the DOM element way (#2824)

Author: coderZoe

src/guide/essentials/event-handling.md

@@ -116,7 +116,7 @@ methods: {
 
 </div>
 
-A method handler automatically receives the native DOM Event object that triggers it - in the example above, we are able to access the element dispatching the event via `event.target.tagName`.
+A method handler automatically receives the native DOM Event object that triggers it - in the example above, we are able to access the element dispatching the event via `event.target`.
 
 <div class="composition-api">