DOC: Update CHANGES.txt to put contribution in alphabetical order

Author: Prabhu-LANL

CHANGES.txt

@@ -9,9 +9,6 @@ NOTE: 4.3.0 now requires Python 3.6.0 and above. Python 3.5.x is no longer suppo
 
 RELEASE  VERSION/DATE TO BE FILLED IN LATER
 
-  From Prabhu S. Khalsa:
-    - Fix typo in user documentation (issue #4458)
-
   From Ataf Fazledin Ahamed:
     - Use of NotImplemented instead of NotImplementedError for special methods
       of _ListVariable class
@@ -56,6 +53,9 @@ RELEASE  VERSION/DATE TO BE FILLED IN LATER
     - Fix of the --debug=sconscript option to return exist statements when using return
       statement with stop flag enabled
 
+  From Prabhu S. Khalsa:
+    - Fix typo in user documentation (issue #4458)
+
   From Mats Wichmann:
     - Add support for Python 3.13 (as of alpha 2). So far only affects
       expected bytecodes in ActionTests.py.