Rollup merge of #87842 - steffahn:hidden_broken_intra_doc, r=dtolnay

Fix intra doc link in hidden doc of Iterator::__iterator_get_unchecked

Recently, I edited the import list of the `core::iter::traits::iterator` module (in #85874). This results in a broken intra doc link in a hidden documentation with the effect that `RUSTDOCFLAGS='--document-private-items --document-hidden-items' x doc library/std` fails. (This can be worked around by adding `-Arustdoc::broken-intra-doc-links`; still, it’s a broken link so let’s fix it.)

``@rustbot`` label C-cleanup, T-libs

Author: JohnTitor

library/core/src/iter/traits/iterator.rs

@@ -3452,7 +3452,7 @@ pub trait Iterator {
         self.map(f).is_sorted()
     }
 
-    /// See [TrustedRandomAccess]
+    /// See [TrustedRandomAccess][super::super::TrustedRandomAccess]
     // The unusual name is to avoid name collisions in method resolution
     // see #76479.
     #[inline]