update intro text to reflect stability

Author: guybedford

doc/api/esm.md

@@ -65,15 +65,9 @@ console.log(addTwo(4));
 ```
 
 Node.js fully supports ECMAScript modules as they are currently specified and
-provides limited interoperability between them and the existing module format,
+provides interoperability between them and its original module format,
 [CommonJS][].
 
-Node.js contains support for ES Modules based upon the
-[Node.js EP for ES Modules][] and the [ECMAScript-modules implementation][].
-
-Expect major changes in the implementation including interoperability support,
-specifier resolution, and default behavior.
-
 <!-- Anchors to make sure old links find a target -->
 <i id="#esm_package_json_type_field"></i>
 <i id="#esm_package_scope_and_file_extensions"></i>