doc: update addnode rpc help

src/rpc/net.cpp

@@ -265,7 +265,9 @@ static RPCHelpMan addnode()
                 "\nAttempts to add or remove a node from the addnode list.\n"
                 "Or try a connection to a node once.\n"
                 "Nodes added using addnode (or -connect) are protected from DoS disconnection and are not required to be\n"
-                "full nodes/support SegWit as other outbound peers are (though such peers will not be synced from).\n",
+                "full nodes/support SegWit as other outbound peers are (though such peers will not be synced from).\n" +
+                strprintf("Addnode connections are limited to %u at a time", MAX_ADDNODE_CONNECTIONS) +
+                " and are counted separately from the -maxconnections limit.\n",
                 {
                     {"node", RPCArg::Type::STR, RPCArg::Optional::NO, "The node (see getpeerinfo for nodes)"},
                     {"command", RPCArg::Type::STR, RPCArg::Optional::NO, "'add' to add a node to the list, 'remove' to remove a node from the list, 'onetry' to try a connection to the node once"},