Code formatting and doc update (#2130)

docs/features/langchain-tools.mdx

@@ -27,9 +27,9 @@ from pydantic import BaseModel, Field
 from typing import List, Dict, Any, Optional
 
 client = MemoryClient(
-    "---",
-    org_id="---",
-    project_id="---"
+    api_key=your_api_key,
+    org_id=your_org_id,
+    project_id=your_project_id
 )
 ```