title: Alphabetical ToC counter
body: <p>How do I change the counter in ToC to letters (A, B, C)?</p>
  
  <p>To illustrate:</p>
  
  <p>from</p>
  
  <pre><code>1. Section
  2. Section
  3. Section
  </code></pre>
  
  <p>to</p>
  
  <pre><code>A. Section
  B. Section
  C. Section
  </code></pre>
  
  <p>Thanks</p>