Make the chat history example read better top-to-bottom

Author: borkweb

docs/ARCHITECTURE.md

@@ -181,11 +181,13 @@ _Note: Similarly to the previous example, even without specifying the model here
 
 ##### Fluent API
 ```php
+$history = [
+    new UserMessage('Do you spell it WordPress or Wordpress?'),
+    new AgentMessage('The correct spelling is WordPress.'),
+];
+
 $text = AiClient::prompt('Can you repeat that please?')
-    ->withHistory(
-        new UserMessage('Do you spell it WordPress or Wordpress?'),
-        new AgentMessage('The correct spelling is WordPress.')
-    )
+    ->withHistory(...$history)
     ->generateText();
 ```