Update app/views/how-tos/index.html

Co-authored-by: Frankie Roberto <[email protected]>

app/views/how-tos/index.html

@@ -24,7 +24,7 @@ <h2>Get started</h2>
       <ul class="govuk-list govuk-list--bullet">
         <li>
           <a href="./how-tos/make-first-prototype/start">Build a basic prototype</a>
-          <ol class="govuk-list govuk-list--number">
+          <ol class="nhsuk-list nhsuk-list--number">
             <li>
               <a href="/how-tos/make-first-prototype/open-prototype-in-editor">Open your prototype in your editor</a>
             </li>