[Minor] Fix the path typo in loader.py: save_sharded_states.py -> save_sharded_state.py (#5151)

Signed-off-by: Ye Cao <caoye.cao@alibaba-inc.com>

vllm/model_executor/model_loader/loader.py

@@ -386,7 +386,7 @@ class ShardedStateLoader(BaseModelLoader):
     Model loader that directly loads each worker's model state dict, which
     enables a fast load path for large tensor-parallel models where each worker
     only needs to read its own shard rather than the entire checkpoint. See
-    `examples/save_sharded_states.py` for creating a sharded checkpoint.
+    `examples/save_sharded_state.py` for creating a sharded checkpoint.
     """
 
     DEFAULT_PATTERN = "model-rank-{rank}-part-{part}.safetensors"