fixup link

Co-Authored-By: Jonas Schievink <[email protected]>

Author: Mark-Simulacrum

posts/2019-09-26-Rust-1.38.0.md

@@ -102,7 +102,7 @@ Additionally, these functions have been stabilized:
   `overflowing`, and `wrapping` versions are also available.
 
 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
-[`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
+[`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast-1
 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
 [`Duration::div_duration_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_duration_f32