docs: replace some html links with rustdoc paths (#2381)

Included changes
- all simple references like `<type>.<name>.html` for these types
    - enum
    - fn
    - struct
    - trait
    - type
- simple references for methods, like struct.DelayQueue.html#method.poll

Refs: #1473

2 files changed, 6 insertions, 6 deletions

diff --git a/tokio/src/task/local.rs b/tokio/src/task/local.rs
index fcb8c789..551362a1 100644
--- a/tokio/src/task/local.rs
+++ b/tokio/src/task/local.rs
@@ -105,9 +105,9 @@ cfg_rt_util! {
     /// ```
     ///
     /// [`Send`]: https://doc.rust-lang.org/std/marker/trait.Send.html
-    /// [local task set]: struct.LocalSet.html
+    /// [local task set]: struct@LocalSet
     /// [`Runtime::block_on`]: ../struct.Runtime.html#method.block_on
-    /// [`task::spawn_local`]: fn.spawn.html
+    /// [`task::spawn_local`]: fn@spawn_local
     pub struct LocalSet {
         /// Current scheduler tick
         tick: Cell<u8>,
@@ -266,7 +266,7 @@ impl LocalSet {
     ///     }).await;
     /// }
     /// ```
-    /// [`spawn_local`]: fn.spawn_local.html
+    /// [`spawn_local`]: fn@spawn_local
     pub fn spawn_local<F>(&self, future: F) -> JoinHandle<F::Output>
     where
         F: Future + 'static,
@@ -335,7 +335,7 @@ impl LocalSet {
     /// })
     /// ```
     ///
-    /// [`spawn_local`]: fn.spawn_local.html
+    /// [`spawn_local`]: fn@spawn_local
     /// [`Runtime::block_on`]: ../struct.Runtime.html#method.block_on
     /// [in-place blocking]: ../blocking/fn.in_place.html
     /// [`spawn_blocking`]: ../blocking/fn.spawn_blocking.html
@@ -372,7 +372,7 @@ impl LocalSet {
     /// }
     /// ```
     ///
-    /// [`spawn_local`]: fn.spawn_local.html
+    /// [`spawn_local`]: fn@spawn_local
     /// [awaiting the local set]: #awaiting-a-localset
     pub async fn run_until<F>(&self, future: F) -> F::Output
     where
diff --git a/tokio/src/task/task_local.rs b/tokio/src/task/task_local.rs
index a3e7f03f..f3341b6a 100644
--- a/tokio/src/task/task_local.rs
+++ b/tokio/src/task/task_local.rs
@@ -219,7 +219,7 @@ impl<T: 'static, F: Future> Future for TaskLocalFuture<T, F> {
 trait StaticLifetime: 'static {}
 impl<T: 'static> StaticLifetime for T {}
 
-/// An error returned by [`LocalKey::try_with`](struct.LocalKey.html#method.try_with).
+/// An error returned by [`LocalKey::try_with`](method@LocalKey::try_with).
 #[derive(Clone, Copy, Eq, PartialEq)]
 pub struct AccessError {
     _private: (),