[Paddle Hackathon No.11] (#291)

* Create 20220707_api_design_for_multi_margin_loss.md

* Update 20220707_api_design_for_multi_margin_loss.md

* Update 20220707_api_design_for_multi_margin_loss.md

* Update 20220707_api_design_for_multi_margin_loss.md

* Update 20220707_api_design_for_multi_margin_loss.md

* Update 20220707_api_design_for_multi_margin_loss.md

Author: yangguohao

rfcs/APIs/20220707_api_design_for_multi_margin_loss.md

@@ -146,8 +146,9 @@ tensorflow没有专门的multimarginloss
 - paddle.nn.MultiMarginLoss(
     p:int = 1,
     margin:float=1.0,
-    weight (Tensor,可选), 
-    reduction(str,可选), 
+    weight=None, 
+    reduction='mean', 
+    name=None,
 ) -> None:
 
 ## 底层OP设计