Update src/liballoc/vec.rs

Co-authored-by: Joshua Nelson <[email protected]>

Author: pickfire

library/alloc/src/vec.rs

@@ -2621,7 +2621,6 @@ where
 /// This `struct` is created by the `into_iter` method on [`Vec`] (provided
 /// by the [`IntoIterator`] trait).
 ///
-/// [`IntoIterator`]: ../../std/iter/trait.IntoIterator.html
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct IntoIter<T> {
     buf: NonNull<T>,