Update accessibility-statement.html.erb

Making Antonia's suggested changes to consolidate a heading and fix inconsistent hyphenation

source/accessibility-statement.html.erb

@@ -39,11 +39,8 @@ title: Accessibility statement for GOV.UK Pay
           <%= link_to 'AbilityNet', 'https://mcmw.abilitynet.org.uk', class: 'govuk-link' %>
           has advice on making your device easier to use if you have a disability.
         </p>
-        <h2 class="govuk-heading-m">Non accessible content</h2>
+        <h2 class="govuk-heading-m">Non-compliance with accessibility criteria</h2>
         <p class="govuk-body">The content listed below is non-accessible for the following reasons.</p>
-
-        <h3 class="govuk-heading-s">Non-compliance with the accessibility regulations</h3>
-
         <p class="govuk-body">
           You cannot use autocomplete to populate the country field on our payment pages. This is to ensure that the country used is from the GOV.UK&nbsp;Pay validated dataset.
           Most users will not be affected, as the United Kingdom is the default value.