BUG: rm operator `==` from documentation of grammar
BUG: rm operator `==` from documentation of grammar

The operator `==` was removed from the parser
in commit e2600d48a1003cfc2d2053597429c7ad390e795a.

`tulip` parses expressions, not definitions,
so the addition of `==` in the future to this
parser seems unlikely.

tulip-control/tulip-control,tulip-control/tulip-control,tulip-control/tulip-control,tulip-control/tulip-control