docs(guide/directive): update since 'EA' is now the default restrict value

11f5aee changed the compiler to use 'EA' as a 'restrict'
value if not specified in the directive object, and the directive guide needed some slight
changes to address this.

Closes #8769

Author: akhlesh

docs/content/guide/directive.ngdoc

@@ -285,8 +285,8 @@ Great! But what if we wanted to have our directive match the tag name `<my-custo
 If we simply put a `<my-customer>` element into the HTML, it doesn't work.
 
 <div class="alert alert-warning">
-**Note:** When you create a directive, it is restricted to attribute only by default. In order to
-create directives that are triggered by element or class name, you need to use the `restrict` option.
+**Note:** When you create a directive, it is restricted to attribute and elements only by default. In order to
+create directives that are triggered by class name, you need to use the `restrict` option.
 </div>
 
 The `restrict` option is typically set to: