Update links for custom discriminants.

Author: ehuss

compiler/rustc_error_codes/src/error_codes/E0080.md

@@ -15,9 +15,8 @@ or causing an integer overflow are two ways to induce this error.
 
 Ensure that the expressions given can be evaluated as the desired integer type.
 
-See the [Custom Discriminants][custom-discriminants] section of the Reference
-for more information about setting custom integer types on fieldless enums
-using the [`repr` attribute][repr-attribute].
+See the [Discriminants] section of the Reference for more information about
+setting custom integer types on enums using the [`repr` attribute][repr-attribute].
 
-[custom-discriminants]: https://doc.rust-lang.org/reference/items/enumerations.html#custom-discriminant-values-for-field-less-enumerations
-[repr-attribute]: https://doc.rust-lang.org/reference/type-layout.html#reprc-enums
+[discriminants]: https://doc.rust-lang.org/reference/items/enumerations.html#discriminants
+[repr-attribute]: https://doc.rust-lang.org/reference/type-layout.html#representations