title: Change a text in Woocommerce customer processing and completed email notifications
body: <p>I'm trying to use Woocommerce hooks to make changes in specific email templates.  I'd like to override the text in <code>customer-processing-order.php</code> and <code>customer-completed-order.php</code> in my <code>functions.php</code> file. Here is the code I am using:</p>
  
  <pre><code>add_action( 'woocommerce_email_customer_details', 'hitt_processing_customer_email', 10, 4 );
  function hitt_processing_customer_email( $order, $sent_to_admin, $plain_text, $email ) {
  
      if( 'customer_processing_order' == $email-&gt;id ){
          echo '&lt;p&gt;My custom content here&lt;/p&gt;';
      }
  
      if( 'customer_completed_order' == $email-&gt;id ){
          echo '&lt;p&gt;My custom content here&lt;/p&gt;';
      }
  }
  </code></pre>
  
  <p>But this doesn't seem to be working.  I set myself as the customer and when I got the <em>"your order is being processed"</em> email, it did not have the custom text added. What am I doing wrong?</p>