Portability links should point at /learn/portability.html

[amirmc]

Portability links in Release notes still point back to the old caml inria site. They should instead point to http://preview.ocaml.org/learn/portability.html

[agarwal]

A more thorough search is justified, something like:

find . -type f | while read i; do grep -H "caml.inria.fr" $i; done

[gurleennsidhuu]

Hi. Is this issue still open? If yes, I would like to work on this. :)