gh-114827: clarify threading.Event.wait timeout behavior (#114834)

Co-authored-by: Kumar Aditya <[email protected]>

Author: beauxq

Lib/threading.py

@@ -653,7 +653,8 @@ def wait(self, timeout=None):
         (or fractions thereof).
 
         This method returns the internal flag on exit, so it will always return
-        True except if a timeout is given and the operation times out.
+        ``True`` except if a timeout is given and the operation times out, when
+        it will return ``False``.
 
         """
         with self._cond: