add comments for _extends\graph_kernel\expanders\__init__.py

src/mindspore2022/mindspore/python/mindspore/_extends/graph_kernel/expanders/__init__.py

@@ -13,6 +13,7 @@
 # limitations under the License.
 # ============================================================================
 """expanders init. Deprecated, please add the new operators in the c++ file"""
+"""扩展器初始化。已弃用，请在新运算符中添加C++文件"""
 
 
 from .addn import AddN