Fix beta branch

This test tests a message that is only displayed on nightly.

Author: brson

src/test/compile-fail/feature-gate-try-operator.rs

@@ -14,7 +14,5 @@ macro_rules! id {
 
 fn main() {
     id!(x?);  //~ error: the `?` operator is not stable (see issue #31436)
-    //~^ help: add #![feature(question_mark)] to the crate attributes to enable
     y?;  //~ error: the `?` operator is not stable (see issue #31436)
-    //~^ help: add #![feature(question_mark)] to the crate attributes to enable
 }