Mention unsigned scheme numbers in abstract

draft-ietf-core-href.md

@@ -92,13 +92,12 @@ memory size.
 [^status]
 
 [^status]: (This "cref" paragraph will be removed by the RFC editor:)\\
-    The present revision –14 of this draft picks up comments from the
-    shepherd review and adds sections on CoAP integration and on `cri`
-    application-oriented literals for the Extended Diagnostic
-    Notation.\\
+    The present revision –15 of this draft continues -14 by picking up
+    more comments, such as moving to a CRI scheme number registration
+    system based on unsigned numbers.
+    \\
     This revision still contains open issues and is intended to serve
-    as a snapshot while the processing of the shepherd review is being
-    completed.
+    as a snapshot.
 
 --- middle