Add supplementary information for get_unchecked(mut)

diff --git a/library/core/src/ptr/const_ptr.rs b/library/core/src/ptr/const_ptr.rs
index db9e60d..56f6a56 100644
--- a/library/core/src/ptr/const_ptr.rs
+++ b/library/core/src/ptr/const_ptr.rs

@@ -1497,9 +1497,10 @@ pub const fn as_ptr(self) -> *const T {
     /// Returns a raw pointer to an element or subslice, without doing bounds
     /// checking.
     ///
-    /// Calling this method with an out-of-bounds index or when `self` is not dereferenceable
+    /// Calling this method with an [out-of-bounds index] or when `self` is not dereferenceable
     /// is *[undefined behavior]* even if the resulting pointer is not used.
     ///
+    /// [out-of-bounds index]: #method.add
     /// [undefined behavior]: https://doc.rust-lang.org/reference/behavior-considered-undefined.html
     ///
     /// # Examples

diff --git a/library/core/src/ptr/non_null.rs b/library/core/src/ptr/non_null.rs
index bafc374..6ec3420 100644
--- a/library/core/src/ptr/non_null.rs
+++ b/library/core/src/ptr/non_null.rs

@@ -1573,9 +1573,10 @@ pub const fn as_mut_ptr(self) -> *mut T {
     /// Returns a raw pointer to an element or subslice, without doing bounds
     /// checking.
     ///
-    /// Calling this method with an out-of-bounds index or when `self` is not dereferenceable
+    /// Calling this method with an [out-of-bounds index] or when `self` is not dereferenceable
     /// is *[undefined behavior]* even if the resulting pointer is not used.
     ///
+    /// [out-of-bounds index]: #method.add
     /// [undefined behavior]: https://doc.rust-lang.org/reference/behavior-considered-undefined.html
     ///
     /// # Examples