Update paper

papers/p3070.bs

@@ -1,5 +1,5 @@
 <pre class='metadata'>
-Title: Formatting enums and other user-defined types via forwarding
+Title: Formatting enums
 Shortname: P3070
 Revision: 3
 Audience: LEWG
@@ -250,6 +250,8 @@ template<class T> explicit basic_format_arg(T& v) noexcept;
 `static_cast<const char_type*>(v)` points to a NTCTS ([[defns.ntcts](
 https://eel.is/c++draft/defns.ntcts)]).
 
+<!-- ADL part is based on https://eel.is/c++draft/range.access.begin -->
+
 *Effects*: Let `TD` be `remove_const_t<T>`.
 <ins>
 If `format_as(v)` is a valid expression and `TD` is a class or enumeration type,