title: New line (\n) in substring does not work in Utilities.formatString
body: <p>I am generating a google doc files through a <code>google-apps-script</code>. I see an interesting behavior by <code>Utilities.formatString</code> function.</p>
  
  <pre><code>var string = Utilities.formatString('apples \n oranges')
  </code></pre>
  
  <p>gives</p>
  
  <pre><code>apples
  oranges
  </code></pre>
  
  <p>But if I feed the same line via substring,</p>
  
  <pre><code>var substring = 'apples \n oranges'
  var string = Utilities.formatString('%s' , substring)
  </code></pre>
  
  <p>gives</p>
  
  <pre><code>apples \n oranges
  </code></pre>
  
  <p>Q: What's the fix? </p>