Improve diagnostic for break in async { ... } block

With:

#![feature(async_await)]

fn foo() {
    async {
        break;
    };
}

you get:

error[E0267]: `break` inside of a closure
 --> src/lib.rs:5:9
  |
5 |         break;
  |         ^^^^^ cannot break inside of a closure

Note how it references "a closure" which seems confusing for a user who doesn't presume the implementation.

@rustbot

I'm assuming its ok to leave this as the same error code of E0267 - in essence it's the same error, just more specific text.

Yeah I think it's fine.

Rollup merge of rust-lang#63659 - gilescope:async-in-closure, r=Centril

Auto merge of #63659 - gilescope:async-in-closure, r=Centril

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