Update draft-ietf-quic-recovery.md

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

draft-ietf-quic-recovery.md

@@ -448,7 +448,7 @@ When a crypto packet is sent, the sender MUST set a timer for twice the smoothed
 RTT.  This timer MUST be updated when a new crypto packet is sent and when
 an acknowledgement is received which computes a new RTT sample. Upon timeout,
 the sender MUST retransmit all unacknowledged CRYPTO data if possible.  The
-sender MUST NOT declare in flight crypto packets as lost when the crypto timer
+sender MUST NOT declare in-flight crypto packets as lost when the crypto timer
 expires.
 
 On each consecutive expiration of the crypto timer without receiving an