Add missing links

src/libcore/fmt/mod.rs

@@ -83,9 +83,12 @@ pub mod rt {
 /// some other means.
 ///
 /// An important thing to remember is that the type `fmt::Error` should not be
-/// confused with `std::io::Error` or `std::error::Error`, which you may also
+/// confused with [`std::io::Error`] or [`std::error::Error`], which you may also
 /// have in scope.
 ///
+/// [`std::io::Error`]: ../../std/io/struct.Error.html
+/// [`std::error::Error`]: ../../std/error/trait.Error.html
+///
 /// # Examples
 ///
 /// ```rust

src/libstd/io/mod.rs

@@ -997,9 +997,9 @@ pub trait Write {
     ///
     /// Calls to `write` are not guaranteed to block waiting for data to be
     /// written, and a write which would otherwise block can be indicated through
-    /// an `Err` variant.
+    /// an [`Err`] variant.
     ///
-    /// If the return value is `Ok(n)` then it must be guaranteed that
+    /// If the return value is [`Ok(n)`] then it must be guaranteed that
     /// `0 <= n <= buf.len()`. A return value of `0` typically means that the
     /// underlying object is no longer able to accept bytes and will likely not
     /// be able to in the future as well, or that the buffer provided is empty.
@@ -1013,9 +1013,13 @@ pub trait Write {
     /// It is **not** considered an error if the entire buffer could not be
     /// written to this writer.
     ///
-    /// An error of the `ErrorKind::Interrupted` kind is non-fatal and the
+    /// An error of the [`ErrorKind::Interrupted`] kind is non-fatal and the
     /// write operation should be retried if there is nothing else to do.
     ///
+    /// [`Err`]: ../../std/result/enum.Result.html#variant.Err
+    /// [`Ok(n)`]:  ../../std/result/enum.Result.html#variant.Ok
+    /// [`ErrorKind::Interrupted`]: ../../std/io/enum.ErrorKind.html#variant.Interrupted
+    ///
     /// # Examples
     ///
     /// ```
@@ -1061,17 +1065,20 @@ pub trait Write {
 
     /// Attempts to write an entire buffer into this write.
     ///
-    /// This method will continuously call `write` until there is no more data
-    /// to be written or an error of non-`ErrorKind::Interrupted` kind is
+    /// This method will continuously call [`write`] until there is no more data
+    /// to be written or an error of non-[`ErrorKind::Interrupted`] kind is
     /// returned. This method will not return until the entire buffer has been
     /// successfully written or such an error occurs. The first error that is
-    /// not of `ErrorKind::Interrupted` kind generated from this method will be
+    /// not of [`ErrorKind::Interrupted`] kind generated from this method will be
     /// returned.
     ///
     /// # Errors
     ///
     /// This function will return the first error of
-    /// non-`ErrorKind::Interrupted` kind that `write` returns.
+    /// non-[`ErrorKind::Interrupted`] kind that [`write`] returns.
+    ///
+    /// [`ErrorKind::Interrupted`]: ../../std/io/enum.ErrorKind.html#variant.Interrupted
+    /// [`write`]: #tymethod.write
     ///
     /// # Examples
     ///