chore: Update class attribute in API ref

Author: imtodor

_buildApi/BuildAPI/docfx-tmpl/src/partials/head.tmpl.partial

@@ -16,7 +16,7 @@
   <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
   <script src="https://cdn.cookielaw.org/scripttemplates/otSDKStub.js" data-language="en" type="text/javascript" charset="UTF-8" data-domain-script="3dfce4f2-dab6-4128-9f33-df7e0597da82"></script>
   <!-- Google Tag Manager -->
-        <script type="text/plain" className="optanon-category-1">(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
+        <script type="text/plain" class="optanon-category-1">(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
         new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
         j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
         'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);