Update .stderr files

Author: eholk

src/test/ui/issues-71798.stderr

@@ -11,6 +11,7 @@ LL | fn test_ref(x: &u32) -> impl std::future::Future<Output = u32> + '_ {
    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `u32` is not a future
    |
    = help: the trait `Future` is not implemented for `u32`
+   = note: u32 must be a future or must implement `IntoFuture` to be awaited
 
 error: aborting due to 2 previous errors
 

src/test/ui/suggestions/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.stderr

@@ -10,6 +10,7 @@ LL |     bar(foo);
    |     required by a bound introduced by this call
    |
    = help: the trait `Future` is not implemented for `fn() -> impl Future<Output = ()> {foo}`
+   = note: fn() -> impl Future<Output = ()> {foo} must be a future or must implement `IntoFuture` to be awaited
 note: required by a bound in `bar`
   --> $DIR/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.rs:7:16
    |
@@ -31,6 +32,7 @@ LL |     bar(async_closure);
    |     required by a bound introduced by this call
    |
    = help: the trait `Future` is not implemented for `[closure@$DIR/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.rs:11:25: 11:36]`
+   = note: [closure@$DIR/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.rs:11:25: 11:36] must be a future or must implement `IntoFuture` to be awaited
 note: required by a bound in `bar`
   --> $DIR/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.rs:7:16
    |