merge bitcoin#20653: Move addr relay comment in net to correct place

comment was moved to net.h in 678df63 (dashpay#4888) and removed entirely in
796353a (dashpay#5771). the comment is being restored back to where it is
upstream, in CNode::RelayAddrsWithConn.

src/net.h

@@ -568,6 +568,9 @@ class CNode
     /* Whether we send addr messages over this connection */
     bool RelayAddrsWithConn() const
     {
+        // Don't relay addr messages to peers that we connect to as block-relay-only
+        // peers (to prevent adversaries from inferring these links from addr
+        // traffic).
         return m_conn_type != ConnectionType::BLOCK_RELAY;
     }