extend comment

Co-authored-by: lcnr <bastian_kauschke@hotmail.de>

Author: RalfJung

library/core/src/ptr/mod.rs

@@ -883,7 +883,8 @@ pub const unsafe fn read_unaligned<T>(src: *const T) -> T {
 #[inline]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub unsafe fn write<T>(dst: *mut T, src: T) {
-    // We are calling the intrinsics directly to avoid function calls in the generated code.
+    // We are calling the intrinsics directly to avoid function calls in the generated code
+    // as `intrinsics::copy_nonoverlapping` is a wrapper function.
     extern "rust-intrinsic" {
         fn copy_nonoverlapping<T>(src: *const T, dst: *mut T, count: usize);
     }