Final change based on @jreback comments

Author: Jean-Mathieu Deschenes

doc/source/whatsnew/v0.20.3.txt

@@ -37,7 +37,7 @@ Performance Improvements
 Bug Fixes
 ~~~~~~~~~
 
-- Bug in ``TimedeltaIndex`` raising a ``ValueError`` when slice indexing with ``loc`` (:issue:`16637`)
+- Bug in a DataFrame/Series with a TimedeltaIndex when slice indexing
 
 
 Conversion