Fix typo in Channel::close documentation

src/channel.rs

@@ -464,7 +464,7 @@ impl Channel {
  /// close message in response.
  ///
  /// To wait for the remote end to close its connection as well, follow this
- /// command with `wait_closed`
+ /// command with `wait_close`
  pub fn close(&mut self) -> Result<(), Error> {
  let locked = self.lock();
  unsafe { locked.sess.rc(raw::libssh2_channel_close(locked.raw)) }