docs: fix some typos (#4632)

Signed-off-by: cuishuang <imcusg@gmail.com>

tokio/src/io/stdio_common.rs

@@ -42,7 +42,7 @@ where
         // for further code. Since `AsyncWrite` can always shrink
         // buffer at its discretion, excessive (i.e. in tests) shrinking
         // does not break correctness.
-        // 2. If buffer is small, it will not be shrinked.
+        // 2. If buffer is small, it will not be shrunk.
         // That's why, it's "textness" will not change, so we don't have
         // to fixup it.
         if cfg!(not(any(target_os = "windows", test))) || buf.len() <= crate::io::blocking::MAX_BUF
@@ -193,7 +193,7 @@ mod tests {
     fn test_pseudo_text() {
         // In this test we write a piece of binary data, whose beginning is
         // text though. We then validate that even in this corner case buffer
-        // was not shrinked too much.
+        // was not shrunk too much.
         let checked_count = super::MAGIC_CONST * super::MAX_BYTES_PER_CHAR;
         let mut data: Vec<u8> = str::repeat("a", checked_count).into();
         data.extend(std::iter::repeat(0b1010_1010).take(MAX_BUF - checked_count + 1));
@@ -212,7 +212,7 @@ mod tests {
             writer.write_history.iter().copied().sum::<usize>(),
             data.len()
         );
-        // Check that at most MAX_BYTES_PER_CHAR + 1 (i.e. 5) bytes were shrinked
+        // Check that at most MAX_BYTES_PER_CHAR + 1 (i.e. 5) bytes were shrunk
         // from the buffer: one because it was outside of MAX_BUF boundary, and
         // up to one "utf8 code point".
         assert!(data.len() - writer.write_history[0] <= super::MAX_BYTES_PER_CHAR + 1);

tokio/src/process/mod.rs

@@ -111,7 +111,7 @@
 //!     let mut cmd = Command::new("sort");
 //!
 //!     // Specifying that we want pipe both the output and the input.
-//!     // Similarily to capturing the output, by configuring the pipe
+//!     // Similarly to capturing the output, by configuring the pipe
 //!     // to stdin it can now be used as an asynchronous writer.
 //!     cmd.stdout(Stdio::piped());
 //!     cmd.stdin(Stdio::piped());

tokio/src/runtime/metrics/runtime.rs

@@ -386,7 +386,7 @@ impl RuntimeMetrics {
     /// Returns the number of tasks currently scheduled in the runtime's
     /// injection queue.
     ///
-    /// Tasks that are spanwed or notified from a non-runtime thread are
+    /// Tasks that are spawned or notified from a non-runtime thread are
     /// scheduled using the runtime's injection queue. This metric returns the
     /// **current** number of tasks pending in the injection queue. As such, the
     /// returned value may increase or decrease as new tasks are scheduled and

tokio/src/runtime/metrics/worker.rs

@@ -1,7 +1,7 @@
 use crate::loom::sync::atomic::Ordering::Relaxed;
 use crate::loom::sync::atomic::{AtomicU64, AtomicUsize};
 
-/// Retreive runtime worker metrics.
+/// Retrieve runtime worker metrics.
 ///
 /// **Note**: This is an [unstable API][unstable]. The public API of this type
 /// may break in 1.x releases. See [the documentation on unstable

tokio/src/runtime/thread_pool/worker.rs

@@ -616,7 +616,7 @@ impl Core {
 
     /// Prepares the worker state for parking.
     ///
-    /// Returns true if the transition happend, false if there is work to do first.
+    /// Returns true if the transition happened, false if there is work to do first.
     fn transition_to_parked(&mut self, worker: &Worker) -> bool {
         // Workers should not park if they have work to do
         if self.lifo_slot.is_some() || self.run_queue.has_tasks() {