docs: better response messages for ADK agent (#460)

docs/en/getting-started/local_quickstart.md

@@ -445,8 +445,15 @@ for query in queries:
     events = runner.run(session_id=session.id,
                         user_id='123', new_message=content)
 
-    for event in events:
-        print(event)
+    responses = (
+      part.text
+      for event in events
+      for part in event.content.parts
+      if part.text is not None
+    )
+
+    for text in responses:
+      print(text)
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 {{< tab header="LangChain" lang="python" >}}