Update src/backend/backend.py

Co-authored-by: Roman Kazantsev <roman.kazantsev@intel.com>

Author: popovaan

src/backend/backend.py

@@ -104,5 +104,5 @@ def cid_file_initialized(self):
     @abc.abstractmethod
     def set_stats(self, data: dict):
         """
-        Pass additional statistic, which will be added to telemetry messages
+        Pass additional statistics, which will be added to telemetry messages
         """