Adjusting discount text for sponsorship based on Rick's recommendations. (SeleniumHQ#2540)

[deploy site]

Author: diemol

website_and_docs/content/sponsor/_index.html

@@ -92,7 +92,7 @@ <h2 class="alert-heading pb-3" id="support-levels">Sponsorship Levels</h2>
             </a>
           </li>
           <li>
-            If you were a sponsor of the most recent
+            <b>Alternatively</b>, if you were a sponsor of the most recent
             <a href="https://seleniumconf.com/" target="_blank" rel="noopener noreferrer">
               Selenium Conference
             </a>