Update src/send-and-sync.md

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

src/send-and-sync.md

@@ -162,7 +162,7 @@ impl<T> DerefMut for Carton<T> {
     fn deref_mut(&mut self) -> &mut Self::Target {
         unsafe {
             // Safety: The pointer is aligned, initialized, and dereferenceable
-            //   by the logic in [`Self::new]. We require writers to mutably
+            //   by the logic in [`Self::new`]. We require writers to mutably
             //   borrow the Carton, and the lifetime of the return value is
             //   elided to the lifetime of the input. This means the borrow
             //   checker will enforce that no one else can access the contents