Fix broken links

Author: John-Mark Allen

library/core/src/convert/mod.rs

@@ -138,7 +138,7 @@ pub const fn identity<T>(x: T) -> T {
 ///
 /// [dereferenceable types]: core::ops::Deref
 /// [pointed-to value]: core::ops::Deref::Target
-/// ['`Deref` coercion']: core::ops::Deref#more-on-deref-coercion
+/// ['`Deref` coercion']: core::ops::Deref#deref-coercion
 ///
 /// ```
 /// let x = Box::new(5i32);
@@ -244,7 +244,7 @@ pub trait AsRef<T: ?Sized> {
 ///
 /// [mutably dereferenceable types]: core::ops::DerefMut
 /// [pointed-to value]: core::ops::Deref::Target
-/// ['`Deref` coercion']: core::ops::DerefMut#more-on-deref-coercion
+/// ['`Deref` coercion']: core::ops::DerefMut#mutable-deref-coercion
 ///
 /// ```
 /// let mut x = Box::new(5i32);

library/core/src/ops/deref.rs

@@ -207,7 +207,7 @@ impl<T: ?Sized> Deref for &mut T {
 ///
 /// [book]: ../../book/ch15-02-deref.html
 /// [coercion]: #mutable-deref-coercion
-/// [implementing]: trait.Deref.html#when-to-implement-deref-or-derefmut
+/// [implementing]: Deref#when-to-implement-deref-or-derefmut
 /// [ref-deref-op]: ../../reference/expressions/operator-expr.html#the-dereference-operator
 /// [method resolution]: ../../reference/expressions/method-call-expr.html
 /// [type coercions]: ../../reference/type-coercions.html