Fix pydocstyle

Author: HardNorth

pytest_reportportal/rp_logging.py

@@ -11,6 +11,7 @@
 
 
 def is_api_worker(target):
+    """Check if target is an RP worker thread."""
     if target:
         method_name = getattr(target, '__name__', None)
         method_self = getattr(target, '__self__', None)