docs: add release notes for gossip v2 policy support

discovery/gossiper_test.go

@@ -4448,7 +4448,9 @@ func TestRateLimitChannelUpdates(t *testing.T) {
 	// our rebroadcast interval.
 	rateLimitKeepAliveUpdate := *batch.chanUpdAnn1
 	rateLimitKeepAliveUpdate.Timestamp++
-	require.NoError(t, signUpdate(remoteKeyPriv1, &rateLimitKeepAliveUpdate))
+	require.NoError(
+		t, signUpdate(remoteKeyPriv1, &rateLimitKeepAliveUpdate),
+	)
 	assertRateLimit(&rateLimitKeepAliveUpdate, nodePeer1, true)
 
 	keepAliveUpdate := *batch.chanUpdAnn1

docs/release-notes/release-notes-0.21.0.md

@@ -179,7 +179,8 @@
 * Prepare the graph DB for handling gossip V2
   nodes and channels [1](https://github.com/lightningnetwork/lnd/pull/10339)
     [2](https://github.com/lightningnetwork/lnd/pull/10379)
-    [3](https://github.com/lightningnetwork/lnd/pull/10380).
+    [3](https://github.com/lightningnetwork/lnd/pull/10380)
+    [4](https://github.com/lightningnetwork/lnd/pull/10542).
 
 ## Code Health