Fix improper sample code in http.markdown

You must consume the data from the response object. #8443

Reviewed-By: James M Snell <jasnell@gmail.com>
PR-URL: #25471

Author: hidekiy

doc/api/http.markdown

@@ -568,6 +568,8 @@ Example:
 
     http.get("http://www.google.com/index.html", function(res) {
       console.log("Got response: " + res.statusCode);
+      // consume response body
+      res.resume();
     }).on('error', function(e) {
       console.log("Got error: " + e.message);
     });