Update draft-ietf-quic-transport.md

Co-authored-by: Jana Iyengar <jri.ietf@gmail.com>

draft-ietf-quic-transport.md

@@ -4023,7 +4023,7 @@ acknowledged. This includes packets that are acknowledged after being declared
 lost, which can happen in the presence of network reordering. Doing so requires
 senders to retain information about packets after they are declared lost. A
 sender can discard this information after a period of time elapses that
-adequately allows for reordering, such as a PTO ( {{Section 6.2 of
+adequately allows for reordering, such as a PTO ({{Section 6.2 of
 QUIC-RECOVERY}}), or on other events, such as reaching a memory limit.
 
 Upon detecting losses, a sender MUST take appropriate congestion control action.