cargo doc on nightly

[kpp]

mio breaks cargo doc for tokio on nightly.

These links are broken:

diff --git a/src/event_imp.rs b/src/event_imp.rs
index 6c60aad..a114182 100644
--- a/src/event_imp.rs
+++ b/src/event_imp.rs
@@ -708,7 +708,7 @@ impl Ready {
 
     /// Returns true if `Ready` is the empty set
     ///
-    /// See [`Poll`] for more documentation on polling.
+    /// See `Poll` for more documentation on polling.
     ///
     /// # Examples
     ///
diff --git a/src/poll.rs b/src/poll.rs
index a2fcf23..99090ac 100644
--- a/src/poll.rs
+++ b/src/poll.rs
@@ -695,8 +695,8 @@ impl Poll {
     /// readiness. `Poll` will only return readiness events for operations
     /// specified by this argument.
     ///
-    /// If a socket is registered with [`readable`] interest and the socket
-    /// becomes writable, no event will be returned from [`poll`].
+    /// If a socket is registered with `readable` interest and the socket
+    /// becomes writable, no event will be returned from `poll`.
     ///
     /// The readiness interest for an `Evented` handle can be changed at any
     /// time by calling [`reregister`].
@@ -860,7 +860,7 @@ impl Poll {
     ///
     /// When an `Evented` handle is deregistered, the `Poll` instance will
     /// no longer monitor it for readiness state changes. Unlike disabling
-    /// handles with [`oneshot`], deregistering clears up any internal resources
+    /// handles with `oneshot`, deregistering clears up any internal resources
     /// needed to track the handle.
     ///
     /// A handle can be passed back to `register` after it has been

I disabled "[autolink]" syntax but it should be fixed in a correct way.

[kpp]

There is still warning on master:

error: `[Poll]` cannot be resolved, ignoring it...
   --> /home/humbug/mio/src/event_imp.rs:711:14
    |
711 |     /// See [`Poll`] for more documentation on polling.
    |              ^^^^^^ cannot be resolved, ignoring
    |