Update oauth.mdx

docs/clients/auth/oauth.mdx

@@ -111,7 +111,7 @@ await storage.clear()
 To clear *all* tokens for all servers, call the `clear_all` method on the `FileTokenStorage` class:
 
 ```python
-from fastmcp.client.auth import FileTokenStorage
+from fastmcp.client.auth.oauth import FileTokenStorage
 
 FileTokenStorage.clear_all()
-```
+```