Update apps_script_triggers_form region tag

Author: grant

triggers/form/AuthorizationEmail.html

@@ -1,4 +1,4 @@
-<!-- [START respond_to_form_submit] -->
+<!-- [START apps_script_triggers_form] -->
 <p>The Google Sheets add-on <i><?= addonTitle ?></i> is set to run automatically
 whenever a form is submitted. The add-on was recently updated and it needs you
 to re-authorize it to run on your behalf.</p>
@@ -11,4 +11,4 @@
 
 <p>This notification email will be sent to you at most once per day until the
 add-on is re-authorized.</p>
-<!-- [END respond_to_form_submit] -->
+<!-- [END apps_script_triggers_form] -->