Added a mention of the submission automation API on the submission upload page.

 - Legacy-Id: 14228

Author: levkowetz

ietf/templates/submit/upload_submission.html

@@ -20,7 +20,10 @@
 
   <p>This page is used to submit Internet-Drafts to the
     Internet-Draft repository. The list of current Internet-Drafts can be
-    accessed at <a href="https://www.ietf.org/ietf/1id-abstracts.txt">https://www.ietf.org/ietf/1id-abstracts.txt</a></p>
+    accessed at <a href="https://www.ietf.org/ietf/1id-abstracts.txt">https://www.ietf.org/ietf/1id-abstracts.txt</a>.
+    An API for automated draft submission is available at
+    <a href="https://datatracker.ietf.org/api/submit/">https://datatracker.ietf.org/api/submit/</a>.
+  </p>
 
   <p>Internet-Drafts are working documents of the Internet Engineering
     Task Force (IETF), its areas, and its working groups. Note that other