doc: use serial comma in console docs

doc/api/console.md

@@ -11,7 +11,7 @@ the JavaScript console mechanism provided by web browsers.
 
 The module exports two specific components:
 
-* A `Console` class with methods such as `console.log()`, `console.error()` and
+* A `Console` class with methods such as `console.log()`, `console.error()`, and
   `console.warn()` that can be used to write to any Node.js stream.
 * A global `console` instance configured to write to [`process.stdout`][] and
   [`process.stderr`][]. The global `console` can be used without calling