Update

vendor/tailscale.com/wgengine/magicsock/debugknobs.go

@@ -1,4 +1,4 @@
-// Copyright (c) Tailscale Inc & AUTHORS
+// Copyright (c) Tailscale Inc & contributors
 // SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !ios && !js
@@ -62,7 +62,8 @@ var (
 	//
 	//lint:ignore U1000 used on Linux/Darwin only
 	debugPMTUD = envknob.RegisterBool("TS_DEBUG_PMTUD")
-	// debugNeverDirectUDP disables the use of direct UDP connections, forcing
+	// debugNeverDirectUDP disables the use of direct UDP connections by
+	// suppressing/dropping inbound/outbound [disco.Ping] messages, forcing
 	// all peer communication over DERP or peer relay.
 	debugNeverDirectUDP = envknob.RegisterBool("TS_DEBUG_NEVER_DIRECT_UDP")
 	// Hey you! Adding a new debugknob? Make sure to stub it out in the