Update HTTP method reference link in documentation (#2113)

Author: skyeyeye

en/starter/basic-routing.md

@@ -22,7 +22,7 @@ app.METHOD(PATH, HANDLER)
 Where:
 
 - `app` is an instance of `express`.
-- `METHOD` is an [HTTP request method](https://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol#Request_methods), in lowercase.
+- `METHOD` is an [HTTP request method](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods), in lowercase.
 - `PATH` is a path on the server.
 - `HANDLER` is the function executed when the route is matched.