Update dune.opam after change in description (in #2501)
Update dune.opam after change in description (in #2501)

Signed-off-by: François Bobot <8530d62b7eab3cddb9a9239fb10975bf18a1335a@cea.fr>

dra27/jbuilder,janestreet/jbuilder,janestreet/jbuilder,janestreet/jbuilder,janestreet/jbuilder,dra27/jbuilder,janestreet/jbuilder,dra27/jbuilder,dra27/jbuilder,dra27/jbuilder,dra27/jbuilder,janestreet/jbuilder