[Doc] ruff format some Python examples (#26767)

Signed-off-by: DarkLight1337 <tlleungac@connect.ust.hk>

docs/contributing/model/basic.md

@@ -73,8 +73,8 @@ def forward(
     self,
     input_ids: torch.Tensor,
     positions: torch.Tensor,
-    intermediate_tensors: Optional[IntermediateTensors] = None,
-    inputs_embeds: Optional[torch.Tensor] = None,
+    intermediate_tensors: IntermediateTensors | None = None,
+    inputs_embeds: torch.Tensor | None = None,
 ) -> torch.Tensor:
     ...
 ```