title: Changing <title> in Woocommerce page
body: <p>I am trying to change the content of the &lt; title &gt; tag if it's shop. I leave here an example of what I have done:</p>
  <pre><code>function custom_title() {
      if ( is_shop() ) {
          // do stuff to change &lt;title&gt;text&lt;/title&gt;
      }
  }
  add_action ('wp_head', 'custom_title');
  </code></pre>
  <p>Not sure if I am in the right way. Of course I tried to change the title on the shop page, but keeps the  as &quot;Product Archives - [site title]&quot;. Also tried to use the plugin SEO by Yoast with no results.</p>