Fix why3doc not escaping ">" in comments.
Fix why3doc not escaping ">" in comments.

ssaavedra/why3,douglas-larocca/why3,jpdeplaix/why3,douglas-larocca/why3,ssaavedra/why3,jpdeplaix/why3,douglas-larocca/why3,ssaavedra/why3,jpdeplaix/why3