io: fix typo in `AsyncSeekExt::rewind` docs
@@ -69,7 +69,7 @@ cfg_io_util! {
/// Creates a future which will rewind to the beginning of the stream.
///
- /// This is convenience method, equivalent to to `self.seek(SeekFrom::Start(0))`.
+ /// This is convenience method, equivalent to `self.seek(SeekFrom::Start(0))`.
fn rewind(&mut self) -> Seek<'_, Self>
where
Self: Unpin,
