typo in comment

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13398 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
typos in comment

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13399 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
ignore generated files

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13400 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
simplified and extended

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@13401 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02