Fix LinkOrder doc comment error

Signed-off-by: Andre Fredette <afredette@redhat.com>

aya/src/programs/links.rs

@@ -442,7 +442,7 @@ bitflags::bitflags! {
 ///
 /// let prog: &mut SchedClassifier = bpf.program_mut("redirect_ingress").unwrap().try_into()?;
 /// prog.load()?;
-/// let options = TcAttachOptions::tcxoptions(LinkOrder::first());
+/// let options = TcAttachOptions::TcxOrder(LinkOrder::first());
 /// prog.attach_with_options("eth0", TcAttachType::Ingress, options)?;
 ///
 /// # Ok::<(), aya::EbpfError>(())