Address comments

examples/stdin-timeout.rs

@@ -9,22 +9,13 @@ use async_std::prelude::*;
 use async_std::task;
 
 fn main() -> io::Result<()> {
-    task::block_on(async {
+    task::block_on(io::timeout(Duration::from_secs(5), async {
         let stdin = io::stdin();
+
         let mut line = String::new();
+        stdin.read_line(&mut line).await?;
 
-        match stdin
-            .read_line(&mut line)
-            .timeout(Duration::from_secs(5))
-            .await
-        {
-            Ok(res) => {
-                res?;
-                print!("Got line: {}", line);
-            }
-            Err(_) => println!("You have only 5 seconds to enter a line. Try again :)"),
-        }
-
+        print!("Got line: {}", line);
         Ok(())
-    })
+    }))
 }

src/io/timeout.rs

@@ -20,11 +20,12 @@ use crate::task::{Context, Poll};
 ///
 /// use async_std::io;
 ///
-/// let stdin = io::stdin();
-/// let mut line = String::new();
-///
-/// let dur = Duration::from_secs(5);
-/// let n = io::timeout(dur, stdin.read_line(&mut line)).await?;
+/// io::timeout(Duration::from_secs(5), async {
+///     let stdin = io::stdin();
+///     let mut line = String::new();
+///     let n = stdin.read_line(&mut line).await?;
+/// })
+/// .await?;
 /// #
 /// # Ok(()) }) }
 /// ```
@@ -61,7 +62,7 @@ where
             Poll::Pending => match self.delay().poll(cx) {
                 Poll::Ready(_) => Poll::Ready(Err(io::Error::new(
                     io::ErrorKind::TimedOut,
-                    "future has timed out",
+                    "I/O operation has timed out",
                 ))),
                 Poll::Pending => Poll::Pending,
             },