[shardformer] fix type hint

colossalai/shardformer/shard/shard_config.py

@@ -15,8 +15,8 @@ class ShardConfig:
     The config for sharding the huggingface model
 
     Args:
-        tensor_parallel_process_group (int): The process group for tensor parallelism, defaults to None, which is the global process group.
-        pipeline_stage_manager (PipelineStageManager): The pipeline stage manager, defaults to None, which means no pipeline.
+        tensor_parallel_process_group (Optional[ProcessGroup]): The process group for tensor parallelism, defaults to None, which is the global process group.
+        pipeline_stage_manager (Optional[PipelineStageManager]): The pipeline stage manager, defaults to None, which means no pipeline.
         enable_tensor_parallelism (bool): Whether to turn on tensor parallelism, default is True.
         enable_fused_normalization (bool): Whether to use fused layernorm, default is False.
         enable_all_optimization (bool): Whether to turn on all optimization, default is False.