add docstring for AdvertisementPage

apps/advertisement/views/back.py

@@ -101,7 +101,24 @@ class AdvertisementPageCreateView(AdvertisementBackOfficeViewMixin,
 class AdvertisementPageUDView(AdvertisementBackOfficeViewMixin,
                               generics.UpdateAPIView,
                               generics.DestroyAPIView):
-    """Update|Destroy advertisement page view."""
+    """
+    Update/Destroy Advertisement page view.
+
+    **PUT**
+    ```
+    Implement updating AdvertisementPage.
+    ```
+
+    **PATCH**
+    ```
+    Implement partial updating AdvertisementPage.
+    ```
+
+    **DELETE**
+    ```
+    Implement deleting AdvertisementPage.
+    ```
+    """
 
     serializer_class = PageExtendedSerializer