docs: clarify auto-generated secrets in .env.example comment

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: mpk-droid

agents/langflow/simple_tool_calling_agent/local/.env.example

@@ -3,7 +3,8 @@ POSTGRES_USER=langflow
 POSTGRES_PASSWORD=langflow
 POSTGRES_DB=langflow
 
-# Langfuse — auto-generated on first run by deploy-local.sh
+# Langfuse — admin password and encryption key are auto-generated
+# on first run by deploy-local.sh
 LANGFUSE_ADMIN_PASSWORD=
 LANGFUSE_ENCRYPTION_KEY=