DOC-3526 Clarify roles for cert activation

cms/templates/certificates.html

@@ -92,7 +92,7 @@ CMS.User.isGlobalStaff = '${is_global_staff}'=='True' ? true : false;
             <p>${_("To view a sample certificate, choose a course mode and select {em_start}Preview Certificate{em_end}.").format(em_start='<strong>', em_end="</strong>")}</p>
 
             <h3 class="title-3">${_("Issuing Certificates to Learners")}</h3>
-            <p>${_("To begin issuing certificates, a course team member with the Admin role selects {em_start}Activate{em_end}. Only course team members with the Admin role can edit or delete an activated certificate.").format(em_start="<strong>", em_end="</strong>")}</p>
+            <p>${_("To begin issuing course certificates, a course team member with either the Staff or Admin role selects {em_start}Activate{em_end}. Only course team members with these roles can edit or delete an activated certificate.").format(em_start="<strong>", em_end="</strong>")}</p>
             <p>${_("{em_start}Do not{em_end} delete certificates after a course has started; learners who have already earned certificates will no longer be able to access them.").format(em_start="<strong>", em_end="</strong>")}</p>
             <p><a href="${get_online_help_info(online_help_token())['doc_url']}" target="_blank" class="button external-help-button">${_("Learn more about certificates")}</a></p>
           </div>