corect create from descriminator method call

Author: shemogumbe

src/msgraph_core/models/page_result.py

@@ -125,4 +125,4 @@ def serialize(self, writer: SerializationWriter) -> None:
         """
         writer.write_str_value('@odata.nextLink', self.odata_next_link, self.value)
         if self.value is not None:
-            writer.write_collection_of_object_values('key', 'value', list(self.value))
+            writer.write_collection_of_object_values(None, list(self.value))