Add intro line to Accessibility section of sign-up confirmation page

Fix missing <span>

django_app/redbox_app/templates/sign-up-page-4.html

@@ -23,8 +23,8 @@ <h2 class="govuk-heading-m"><span aria-hidden="true">🌱</span> Being an early
           <li><span aria-hidden="true">📋</span> <strong>Engage in surveys and research sessions</strong> - this helps us understand, in-depth, how Redbox is being used</li>
         </ul>
 
-        <h2 class="govuk-heading-m rb-accessibility-heading"><img src="{{ static("icons/accessibility-icon.svg")}} " width="28" alt="" loading="lazy"></span> Accessibility</h2>
-        <p class="govuk-body">If you have any accessibility requirements, we'd be interested to hear about how you find using Redbox. Please provide any feedback via the <a class="govuk-link" href="https://chat.google.com/room/AAAAoEi1_cI?cls=7">Redbox User Community (Google Chat)</a>, or by emailing us at <a href="mailto:{{contact_email}}" class="govuk-link">{{contact_email}}</a>.</p>
+        <h2 class="govuk-heading-m rb-accessibility-heading"><img src="{{ static("icons/accessibility-icon.svg")}} " width="28" alt="" loading="lazy"><span>Accessibility</span></h2>
+        <p class="govuk-body">Ensuring Redbox is accessible to as many users as possible is important to us. If you have any accessibility requirements, we'd be interested to hear about how you find using Redbox. Please provide any feedback via the <a class="govuk-link" href="https://chat.google.com/room/AAAAoEi1_cI?cls=7">Redbox User Community (Google Chat)</a>, or by emailing us at <a href="mailto:{{contact_email}}" class="govuk-link">{{contact_email}}</a>.</p>
 
         <h2 class="govuk-heading-m"><span aria-hidden="true">🏗️</span> Redbox is in private beta</h2>
         <p class="govuk-body">This means it is being actively developed and iterated. You might experience a bit of downtime or find that data, including documents, may be deleted unexpectedly.</p>