Update docstring for _create_relationship_annotations method to clarify its purpose in processing relationship annotations into NDJSON format.

Author: lgluszek

libs/labelbox/src/labelbox/data/serialization/ndjson/label.py

@@ -194,7 +194,7 @@ def _create_non_video_annotations(cls, label: Label):
     def _create_relationship_annotations(
         cls, label: Label
     ) -> Generator[NDRelationship, None, None]:
-        """Creates relationship annotations.
+        """Processes relationship annotations from a label, converting them to NDJSON format.
 
         Args:
             label: Label containing relationship annotations to be processed