Revert "Remove problematic documentation links."

This reverts commit 6a30319.

Author: a1phyr

library/alloc/src/io/error.rs

@@ -109,12 +109,13 @@ pub(super) mod os {
 /// While usual Rust style is to import types directly, aliases of [`Result`]
 /// often are not, to make it easier to distinguish between them. [`Result`] is
 /// generally assumed to be [`std::result::Result`][`Result`], and so users of this alias
-/// will generally use `io::Result` instead of shadowing the prelude's import
+/// will generally use `io::Result` instead of shadowing the [prelude]'s import
 /// of [`std::result::Result`][`Result`].
 ///
 /// [`std::io`]: crate::io
 /// [`io::Error`]: Error
 /// [`Result`]: core::result::Result
+/// [prelude]: crate::prelude
 ///
 /// # Examples
 ///
@@ -135,11 +136,16 @@ pub(super) mod os {
 #[doc(search_unbox)]
 pub type Result<T> = result::Result<T, Error>;
 
-/// The error type for I/O operations.
+/// The error type for I/O operations of the [`Read`], [`Write`], [`Seek`], and
+/// associated traits.
 ///
 /// Errors mostly originate from the underlying OS, but custom instances of
 /// `Error` can be created with crafted error messages and a particular value of
 /// [`ErrorKind`].
+///
+/// [`Read`]: crate::io::Read
+/// [`Write`]: crate::io::Write
+/// [`Seek`]: crate::io::Seek
 #[stable(feature = "rust1", since = "1.0.0")]
 #[rustc_has_incoherent_inherent_impls]
 pub struct Error {
@@ -211,7 +217,7 @@ enum ErrorData<C> {
     Custom(C),
 }
 
-/// The type of raw OS error codes.
+/// The type of raw OS error codes returned by [`Error::raw_os_error`].
 ///
 /// This is an [`i32`] on all currently supported platforms, but platforms
 /// added in the future (such as UEFI) may use a different primitive type like
@@ -407,12 +413,13 @@ pub enum ErrorKind {
     TimedOut,
     // FIXME: restore links to `write` when trait is moved to `alloc`
     /// An error returned when an operation could not be completed because a
-    /// call to `write` returned [`Ok(0)`].
+    /// call to [`write`] returned [`Ok(0)`].
     ///
     /// This typically means that an operation could only succeed if it wrote a
     /// particular number of bytes but only a smaller number of bytes could be
     /// written.
     ///
+    /// [`write`]: crate::io::Write::write
     /// [`Ok(0)`]: Ok
     #[stable(feature = "rust1", since = "1.0.0")]
     WriteZero,