Rephrase the text about one-way text

Author: ekr

draft-ietf-quic-transport.md

@@ -2548,10 +2548,14 @@ receiver SHOULD track which ACK frames have been acknowledged by its peer.  Once
 an ACK frame has been acknowledged, the packets it acknowledges SHOULD NOT be
 acknowledged again.
 
-A receiver that is only sending ACK frames will not receive acknowledgments for
-its packets.  Sending an occasional MAX_DATA or MAX_STREAM_DATA frame as data is
-received will ensure that acknowledgements are generated by a peer.  Otherwise,
-an endpoint MAY send a PING frame once per RTT to solicit an acknowledgment.
+Because ACK-only packets are not acknowledged, a receiver that is only
+sending ACK frames will only receive acknowledgements for its packets
+if the sender piggybacks them on other packets. In order to enable
+this, senders SHOULD prioritize sending ACKs along with their data.
+In addition, if a receiver regularly issues additional flow control
+credit rather than just issuing infinite flow control credit at the
+beginning of the connection, the MAX_DATA and MAX_STREAM_DATA frames
+will elicit acknowledgements from the sender
 
 To limit receiver state or the size of ACK frames, a receiver MAY limit the
 number of ACK blocks it sends.  A receiver can do this even without receiving