fix typo on certificate page

lms/templates/instructor/instructor_dashboard_2/certificates.html

@@ -109,7 +109,7 @@ import json
         <h2>${_("Regenerate Certificates")}</h2>
         <form id="certificate-regenerating-form" method="post" action="${section_data['urls']['start_certificate_regeneration']}">
             <p class="under-heading">
-                ${_('To regenerate certificates for your course, chose the learners who will receive regenerated certificates and click <br/> Regenerate Certificates.')}
+                ${_('To regenerate certificates for your course, choose the learners who will receive regenerated certificates and click <br/> Regenerate Certificates.')}
             </p>
 
                 <label style="display: inline" for="certificate_status_${section_data['status'].downloadable}">