doc: fix indentation issues in sample code

In preparation for stricter ESLint indentation checking, fix a few
issues in sample code.

PR-URL: https://github.com/nodejs/node/pull/13950
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/doc/guides/writing-tests.md b/doc/guides/writing-tests.md
index 688e13a323..9d226da6e8 100644
--- a/doc/guides/writing-tests.md
+++ b/doc/guides/writing-tests.md
@@ -25,13 +25,13 @@ Let's analyze this basic test from the Node.js test suite:
 ```javascript
 'use strict';                                                          // 1
 const common = require('../common');                                   // 2
-                                                                       // 3
+
 // This test ensures that the http-parser can handle UTF-8 characters  // 4
 // in the http header.                                                 // 5
-                                                                       // 6
+
 const assert = require('assert');                                      // 7
 const http = require('http');                                          // 8
-                                                                       // 9
+
 const server = http.createServer(common.mustCall((req, res) => {       // 10
   res.end('ok');                                                       // 11
 }));                                                                   // 12