fixup links in never type docs

Co-authored-by: Jubilee <46493976+workingjubilee@users.noreply.github.com>

library/core/src/primitive_docs.rs

@@ -310,10 +310,10 @@ mod prim_bool {}
 /// change it in the [2024 edition] (and possibly in all editions on a later date); see
 /// [Tracking Issue for making `!` fall back to `!`][fallback-ti].
 ///
-/// [coercion site](https://doc.rust-lang.org/reference/type-coercions.html#coercion-sites)
+/// [coercion site]: <https://doc.rust-lang.org/reference/type-coercions.html#coercion-sites>
 /// [`()`]: prim@unit
-/// [fallback-ti]: https://github.com/rust-lang/rust/issues/123748
-/// [2024 edition]: https://doc.rust-lang.org/nightly/edition-guide/rust-2024/index.html
+/// [fallback-ti]: <https://github.com/rust-lang/rust/issues/123748>
+/// [2024 edition]: <https://doc.rust-lang.org/nightly/edition-guide/rust-2024/index.html>
 ///
 #[unstable(feature = "never_type", issue = "35121")]
 mod prim_never {}