polish(pu): polish qmix comments

Author: puyuan1996

ding/model/template/qmix.py

@@ -167,9 +167,9 @@ def _get_global_obs_shape_type(self, global_obs_shape: Union[int, List[int]]) ->
         Overview:
             Determine the type of global observation shape.
         Arguments:
-            - global_obs_shape (Union[:obj:`int`, :obj:`List[int]`]): The global observation state.
+            - global_obs_shape (:obj:`Union[int, List[int]]`): The global observation state.
         Returns:
-            - (:obj:`str`): 'flat' for 1D observation or 'image' for 3D observation.
+            - obs_shape_type (:obj:`str`): 'flat' for 1D observation or 'image' for 3D observation.
         """
         if isinstance(global_obs_shape, int) or (isinstance(global_obs_shape, list) and len(global_obs_shape) == 1):
             return "flat"
@@ -265,7 +265,7 @@ def _process_global_state(self, global_state: torch.Tensor) -> torch.Tensor:
             - global_state (:obj:`torch.Tensor`): The global state tensor.
 
         Returns:
-            - (:obj:`torch.Tensor`): The processed global state embedding.
+            - global_state_embedding (:obj:`torch.Tensor`): The processed global state embedding.
         """
         # If global_state has 5 dimensions, it's likely in the form [batch_size, time_steps, C, H, W]
         if global_state.dim() == 5: