Rust does automatically takes a reference, sometimes (#2718)

fix #2694

Author: bjornjorgensen

src/references/shared.md

@@ -39,8 +39,8 @@ value.
   will recognize references as pointers. Later parts of the course will cover
   how Rust prevents the memory-safety bugs that come from using raw pointers.
 
-- Rust does not automatically create references for you - the `&` is always
-  required.
+- Explicit referencing with `&` is usually required. However, Rust performs
+  automatic referencing and dereferencing when invoking methods.
 
 - Rust will auto-dereference in some cases, in particular when invoking methods
   (try `r.is_ascii()`). There is no need for an `->` operator like in C++.