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

1 files changed, 1 insertions, 1 deletions

diff --git a/tokio/src/time/timeout.rs b/tokio/src/time/timeout.rs
index 7a372544..401856a8 100644
--- a/tokio/src/time/timeout.rs
+++ b/tokio/src/time/timeout.rs
@@ -2,7 +2,7 @@
 //!
 //! See [`Timeout`] documentation for more details.
 //!
-//! [`Timeout`]: struct.Timeout.html
+//! [`Timeout`]: struct@Timeout
 
 use crate::time::{delay_until, Delay, Duration, Instant};