Fix streaming output to use print_stream helper

Author: OskarStark

examples/openai/agent-stream-sources.php

@@ -37,11 +37,9 @@
 
 $result = $agent->call(new MessageBag(Message::ofUser($prompt)), ['stream' => true]);
 
-foreach ($result->getContent() as $chunk) {
-    echo $chunk->getContent();
-}
+print_stream($result);
 
-echo \PHP_EOL.\PHP_EOL;
+echo \PHP_EOL;
 
 echo 'Used sources:'.\PHP_EOL;
 foreach ($result->getMetadata()->get('sources', []) as $source) {