Improve Access deprecation warning

Author: José Valim

lib/elixir/lib/access.ex

@@ -44,8 +44,9 @@ defmodule Access do
       nil
 
   Since Access is a behaviour, it can be implemented to key-value
-  data structures. Access requires the key comparison to be
-  implemented using the `===` operator.
+  data structures. The implementation should be added to the
+  module that defines the struct being access. Access requires the
+  key comparison to be implemented using the `===` operator.
 
   ## Field-based lookups
 

lib/elixir/lib/protocol.ex

@@ -537,7 +537,7 @@ defmodule Protocol do
       if Atom.to_string(protocol) =~ "Elixir.Access" do
         :elixir_errors.warn __ENV__.line, __ENV__.file,
           "implementation of the Access protocol is deprecated. For customization of " <>
-          "the dict[key] syntax, please implement the Dict behaviour instead"
+          "the data[key] syntax, please implement the Access behaviour in your struct"
       else
         Protocol.assert_protocol!(protocol)
         Protocol.__ensure_defimpl__(protocol, for, __ENV__)