Update draft-ietf-quic-transport.md

Co-Authored-By: kazuho <kazuhooku@gmail.com>

draft-ietf-quic-transport.md

@@ -967,7 +967,7 @@ packet with a previously unused connection ID.  However, it MAY limit the freque
 or the total number of connection IDs issued for each connection to avoid the
 risk of running out of connection IDs (see {{reset-token}}).
 
-Endpoints that initiate migration and require non-zero-length connection IDs
+An endpoint that initiates migration and requires non-zero-length connection IDs
 SHOULD ensure that the pool of connection IDs available to their peers allows
 them to use a new connection ID on migration, as the peer will close the
 connection if the pool is exhausted.