fixed doc for ArgMaxWithValue

mindspore/ops/operations/array_ops.py

@@ -1105,9 +1105,11 @@ class ArgMaxWithValue(PrimitiveWithInfer):
           :math:`(x_1, x_2, ..., x_N)`.
 
     Outputs:
-        Tensor, corresponding index and maximum value of input tensor. If `keep_dims` is true, the output tensors shape
+        tuple(Tensor), tuple of 2 tensors, corresponding index and maximum value of input tensor.
+        - index (Tensor) - The index for maximum value of input tensor. If `keep_dims` is true, the output tensors shape
         is :math:`(x_1, x_2, ..., x_{axis-1}, 1, x_{axis+1}, ..., x_N)`. Else, the shape is
         :math:`(x_1, x_2, ..., x_{axis-1}, x_{axis+1}, ..., x_N)`.
+        - output_x (Tensor) - The maximum value of input tensor, the shape same as index.
 
     Examples:
         >>> input_x = Tensor(np.random.rand(5))