Remove an old hack for rustdoc

Author: GrigorenkoPV

library/std/src/io/buffered/bufreader.rs

@@ -26,8 +26,7 @@ use buffer::Buffer;
 /// unwrapping the `BufReader<R>` with [`BufReader::into_inner`] can also cause
 /// data loss.
 ///
-// HACK(#78696): can't use `crate` for associated items
-/// [`TcpStream::read`]: super::super::super::net::TcpStream::read
+/// [`TcpStream::read`]: crate::net::TcpStream::read
 /// [`TcpStream`]: crate::net::TcpStream
 ///
 /// # Examples

library/std/src/io/buffered/bufwriter.rs

@@ -62,8 +62,7 @@ use crate::ptr;
 /// together by the buffer and will all be written out in one system call when
 /// the `stream` is flushed.
 ///
-// HACK(#78696): can't use `crate` for associated items
-/// [`TcpStream::write`]: super::super::super::net::TcpStream::write
+/// [`TcpStream::write`]: crate::net::TcpStream::write
 /// [`TcpStream`]: crate::net::TcpStream
 /// [`flush`]: BufWriter::flush
 #[stable(feature = "rust1", since = "1.0.0")]