Added a note to the draft/RFC stats pages about missing data.

- Legacy-Id: 15973

ietf/templates/stats/document_stats.html

@@ -66,6 +66,31 @@
     </div>
   </div>
 
+  <div class="alert alert-info ">
+
+    <b>Please Note:</b> The author information in the datatracker about RFCs
+    with numbers lower than about 1300 and drafts from before 2001 is
+    unreliable and in many cases absent.  For this reason, statistics on these
+    pages does not show correct author stats for corpus selections that involve such
+    documents.
+
+    <!--
+    <br/>
+    <br/>
+
+
+    The reason for this situation is that Datatracker is primarily focused on
+    managing workflow, not trying to provide history from the beginning of
+    time.  The Tools Team has talked about ways to crowd source this
+    information, but the tooling to allow people with Datatracker accounts
+    enter the author data is likely to be quite a bit of work, and is not
+    imminent.
+
+    -->
+
+  </div>
+
+  
   <div class="document-stats">
     {% include content_template %}
   </div>