updated whatsnew/3.3.rst with the new methods added to list and bytearray (issue 10516)
diff --git a/Doc/whatsnew/3.3.rst b/Doc/whatsnew/3.3.rst
index ae7b3af..ca123cd 100644
--- a/Doc/whatsnew/3.3.rst
+++ b/Doc/whatsnew/3.3.rst
@@ -481,6 +481,10 @@
 
   (:issue:`14205`)
 
+* New methods have been added to :class:`list` and :class:`bytearray`:
+  ``copy()`` and ``clear()``.
+
+  (:issue:`10516`)
 
 New and Improved Modules
 ========================