Bless clippy tests.

Author: m-ou-se

tests/ui/crashes/ice-3969.stderr

@@ -6,7 +6,7 @@ LL |     for<'a> Dst<A + 'a>: Sized,
    |
    = note: `-D bare-trait-objects` implied by `-D warnings`
    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
-   = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
+   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
 
 error: trait objects without an explicit `dyn` are deprecated
   --> $DIR/ice-3969.rs:27:16
@@ -15,7 +15,7 @@ LL |     let x: Dst<A> = *(Box::new(Dst { x: 1 }) as Box<Dst<A>>);
    |                ^ help: use `dyn`: `dyn A`
    |
    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
-   = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
+   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
 
 error: trait objects without an explicit `dyn` are deprecated
   --> $DIR/ice-3969.rs:27:57
@@ -24,7 +24,7 @@ LL |     let x: Dst<A> = *(Box::new(Dst { x: 1 }) as Box<Dst<A>>);
    |                                                         ^ help: use `dyn`: `dyn A`
    |
    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
-   = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
+   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
 
 error: aborting due to 3 previous errors