Update example error message in docs

Author: dtolnay

README.md

@@ -21,17 +21,18 @@ pub fn make() -> Box<dyn Trait> {
 ```
 
 ```console
-error[E0038]: the trait `Trait` cannot be made into an object
+error[E0038]: the trait `Trait` is not dyn compatible
  --> src/main.rs:5:22
   |
 5 | pub fn make() -> Box<dyn Trait> {
-  |                      ^^^^^^^^^ `Trait` cannot be made into an object
+  |                      ^^^^^^^^^ `Trait` is not dyn compatible
   |
-note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
+note: for a trait to be dyn compatible it needs to allow building a vtable
+      for more information, visit <https://doc.rust-lang.org/reference/items/traits.html#dyn-compatibility>
  --> src/main.rs:2:14
   |
 1 | pub trait Trait {
-  |           ----- this trait cannot be made into an object...
+  |           ----- this trait is not dyn compatible...
 2 |     async fn f(&self);
   |              ^ ...because method `f` is `async`
   = help: consider moving `f` to another trait

src/lib.rs

@@ -23,17 +23,18 @@
 //! ```
 //!
 //! ```text
-//! error[E0038]: the trait `Trait` cannot be made into an object
+//! error[E0038]: the trait `Trait` is not dyn compatible
 //!  --> src/main.rs:5:22
 //!   |
 //! 5 | pub fn make() -> Box<dyn Trait> {
-//!   |                      ^^^^^^^^^ `Trait` cannot be made into an object
+//!   |                      ^^^^^^^^^ `Trait` is not dyn compatible
 //!   |
-//! note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
+//! note: for a trait to be dyn compatible it needs to allow building a vtable
+//!       for more information, visit <https://doc.rust-lang.org/reference/items/traits.html#dyn-compatibility>
 //!  --> src/main.rs:2:14
 //!   |
 //! 1 | pub trait Trait {
-//!   |           ----- this trait cannot be made into an object...
+//!   |           ----- this trait is not dyn compatible...
 //! 2 |     async fn f(&self);
 //!   |              ^ ...because method `f` is `async`
 //!   = help: consider moving `f` to another trait