Clean up extraneous code block

Author: jahooma

web/src/content/walkthroughs/creating-your-first-agent.mdx

@@ -85,7 +85,7 @@ const definition: AgentDefinition = {
     'read_files',
     'run_terminal_command',
     'code_search',
-    'spawn_agents'
+    'spawn_agents',
   ],
 
   // Other agents this agent can spawn
@@ -390,7 +390,3 @@ spawnableAgents: [
 - ✅ Explored advanced programmatic control with `handleSteps`
 
 You're now ready to build sophisticated agents and contribute to the Codebuff ecosystem!
-
-```
-
-```