io: fix typo on AsyncWrite doc
@@ -51,7 +51,7 @@ pub trait AsyncWrite {
/// If the object is not ready for writing, the method returns
/// `Poll::Pending` and arranges for the current task (via
/// `cx.waker()`) to receive a notification when the object becomes
- /// readable or is closed.
+ /// writable or is closed.
fn poll_write(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
