Add blank line in AI configuration for better readability

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: OskarStark

demo/config/packages/ai.yaml

@@ -78,6 +78,7 @@ services:
     Symfony\AI\Agent\Toolbox\Tool\SimilaritySearch:
         $vectorizer: '@ai.vectorizer.openai'
         $store: '@ai.store.chroma_db.symfonycon'
+
     # Symfony\AI\Toolbox\Tool\OpenMeteo: ~
     # Symfony\AI\Toolbox\Tool\SerpApi:
     #     $apiKey: '%env(SERP_API_KEY)%'