discv5: links update

Author: fjl

discv5/discv5-theory.md

@@ -501,11 +501,10 @@ number of retries) that peer is considered unresponsive and the session can be f
 [RELAYINIT]: ./discv5-wire.md#relayinit-notification-0x07
 [RELAYMSG]: ./discv5-wire.md#relaymsg-notification-0x08
 
-[UDP communication]: ./discv5-wire.md#udp-communication
 [Sessions]: ./discv5-theory.md#sessions
 [liveness check]: ./discv5-theory.md#table-maintenance-in-practice
 [runtime address discovery]: ./discv5-theory.md#maintaining-the-local-node-record
-[mechanism for keeping holes punched]: ./discv5-theory.md#job-of-keeping-the-hole-punched-falls-on-bob-and-bob's-incentive-to-do-so
+[mechanism for keeping holes punched]: ./discv5-theory.md#job-of-keeping-the-hole-punched-falls-on-bob-and-bobs-incentive-to-do-so
 
 [natpaper]: https://pdos.csail.mit.edu/papers/p2pnat.pdf
 [RFC4787]: https://datatracker.ietf.org/doc/html/rfc4787