Retransmit server initial upon second Initial

draft-ietf-quic-recovery.md

@@ -528,9 +528,9 @@ Initial was lost.
 
 To speed handshake completion, either peer MAY send a packet containing unacknowledged
 Initial CRYPTO data subject to the path validation limits, as though the PTO
-expired. A client may send a retransmittable packet if all Initial data has been
-acknowledged.  The PTO may only be shortened once in this way.  Subsequently the PTO
-uses the normal calculation with exponential backoff.
+expired. A client may send an ack-eliciting packet with no CRYPTO data if all Initial
+data has been acknowledged.  The PTO may only be shortened once in this way.
+Subsequently the PTO uses the normal calculation with exponential backoff.
 
 Peers can also use coalesced packets to ensure each datagram elicits at least one
 acknowledgement.