doc: fix typo in http.md

PR-URL: https://github.com/nodejs/node/pull/9144
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Brian White <mscdex@mscdex.net>

doc/api/http.md

@@ -289,7 +289,7 @@ Emitted each time a server responds to a request with a `CONNECT` method. If thi
 event isn't being listened for, clients receiving a `CONNECT` method will have
 their connections closed.
 
-A client server pair that show you how to listen for the `'connect'` event.
+A client and server pair that shows you how to listen for the `'connect'` event:
 
 ```js
 const http = require('http');