grep out a few more menhir messages we dont want in the book output
grep out a few more menhir messages we dont want in the book output

nasrallahmounir/examples,devsmt/realworldocaml_examples,nasrallahmounir/examples,devsmt/realworldocaml_examples,realworldocaml/examples,nasrallahmounir/examples,realworldocaml/examples,devsmt/realworldocaml_examples,realworldocaml/examples,realworldocaml/examples,nasrallahmounir/examples,devsmt/realworldocaml_examples,nasrallahmounir/examples