Update src/libcore/mem.rs

Co-Authored-By: RalfJung <post@ralfj.de>

src/libcore/mem.rs

@@ -942,7 +942,7 @@ pub fn discriminant<T>(v: &T) -> Discriminant<T> {
 /// }
 /// ```
 ///
-/// [`mem::zeroed']: fn.zeroed.html
+/// [`mem::zeroed`]: fn.zeroed.html
 #[stable(feature = "manually_drop", since = "1.20.0")]
 #[lang = "manually_drop"]
 #[derive(Copy, Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]