Merge pull request #831 from alphagov/PP-13868-update-copy

PP-13868 Update copy with correct curly apostrophe

Author: marcotranchino

source/index.html.erb

@@ -92,7 +92,7 @@ description: GOV.UK Pay is for central government, local authorities, police and
       </div>
       <div class="govuk-grid-row">
         <div class="govuk-grid-column-one-half">
-          <h2 class="content-section__title govuk-heading-m">Or use GOV.UK&nbsp;Pay's API in your digital service</h2>
+          <h2 class="content-section__title govuk-heading-m">Or use GOV.UK&nbsp;Pay’s API in your digital service</h2>
           <p class="govuk-body">
             We also have an API so you can seamslessly
             <%= link_to 'integrate GOV.UK&nbsp;Pay into your full digital service.', 'api-integration', class: 'govuk-link' %>