Update draft-ietf-quic-http.md

Co-Authored-By: ianswett <ianswett@users.noreply.github.com>

draft-ietf-quic-http.md

@@ -689,7 +689,7 @@ DUPLICATE_PUSH frame (see {{frame-duplicate-push}}).
 
 Ordering of a PUSH_PROMISE or DUPLICATE_PUSH in relation to certain parts of the
 response is important. The server SHOULD send PUSH_PROMISE or DUPLICATE_PUSH
-frames prior to sending any frames that reference the promised responses.  This
+frames prior to sending HEADERS or DATA frames that reference the promised responses.  This
 reduces the chance that a client requests a resource that will be pushed by the
 server.