add missing Changes entry for PR#4231, PR#5461
add missing Changes entry for PR#4231, PR#5461

yunxing/ocaml,gerdstolpmann/ocaml,msprotz/ocaml,gerdstolpmann/ocaml,msprotz/ocaml,yunxing/ocaml,gerdstolpmann/ocaml,eliberis/ocaml,msprotz/ocaml,eliberis/ocaml,gerdstolpmann/ocaml,eliberis/ocaml,yunxing/ocaml,eliberis/ocaml,msprotz/ocaml,yunxing/ocaml,gerdstolpmann/ocaml,eliberis/ocaml,yunxing/ocaml,msprotz/ocaml