Update draft-ietf-quic-recovery.md

draft-ietf-quic-recovery.md

@@ -504,7 +504,7 @@ When a PTO timer expires, the PTO backoff MUST be increased, resulting in the
 PTO period being set to twice its current value.  The PTO period is set based
 on the latest RTT information when receiving an acknowledgement. The PTO backoff
 is reset upon receiving an acknowledgement unless it's a client unsure if the
-the server has validating the client's address. Not resetting the backoff during
+the server has validated the client's address. Not resetting the backoff during
 peer addresss validation ensures the client's anti-deadlock timer is not set too
 aggressively when the server is slow in responding with handshake data.