use pycon

Author: SigureMo

docs/dev_guides/api_contributing_guides/new_cpp_op_cn.md

@@ -818,7 +818,7 @@ def trace(
         Tensor: the output data type is the same as input data type.
 
     Examples:
-        .. code-block:: python-console
+        .. code-block:: pycon
 
             >>> import paddle