Update src/send-and-sync.md

Co-authored-by: Yuki Okushi <jtitor@2k36.org>

src/send-and-sync.md

@@ -141,7 +141,7 @@ that.
 use std::ops::{Deref, DerefMut};
 
 # struct Carton<T>(std::ptr::NonNull<T>);
-
+#
 impl<T> Deref for Carton<T> {
     type Target = T;