Fix alpha order of an entry in changelog

Changes.old

@@ -14038,11 +14038,6 @@ execve.2
         The floating-point environment is reset to the default
         during an execve().
 
-getitimer.2
-    mtk
-        CONFORMING TO: POSIX.1-2008 marks getitimer() and setitimer()
-        obsolete.
-
 get_mempolicy.2
     Lee Schermerhorn
         Misc cleanup of get_mempolicy(2):
@@ -14058,6 +14053,11 @@ get_mempolicy.2
         Document additional EINVAL error that occurs is MPOL_F_MEMS_ALLOWED
         is specified with either MPOL_F_ADDR or MPOL_F_NODE.
 
+getitimer.2
+    mtk
+        CONFORMING TO: POSIX.1-2008 marks getitimer() and setitimer()
+        obsolete.
+
 mbind.2
     Lee Schermerhorn
         Fix error conditions, now that the kernel silently ignores