fix: correct typo in resources readme (#24)

Author: edragic

exercises/03.resources/README.mdx

@@ -51,7 +51,7 @@ sequenceDiagram
 
 <callout-warning>
 	Reminder, the MCP spec only defines the relationship between client and
-	server. The rest of the user experience is controled by the creator of the
+	server. The rest of the user experience is controlled by the creator of the
 	client.
 </callout-warning>