Mind the full stop

Co-authored-by: Brett Cannon <[email protected]>

Author: tiran

Lib/test/support/threading_helper.py

@@ -237,7 +237,7 @@ def _can_start_thread() -> bool:
 can_start_thread = _can_start_thread()
 
 def requires_working_threading(*, module=False):
-    """Skip tests or modules that require working threading
+    """Skip tests or modules that require working threading.
 
     Can be used as a function/class decorator or to skip an entire module.
     """