Merge "Improve documentation of IpSecTunnelInterface#setUnderlyingNetwork"

         *

         * @param underlyingNetwork the new {@link Network} that will carry traffic for this tunnel.

         *     This network MUST never be the network exposing this IpSecTunnelInterface, otherwise

         *     this method will throw an {@link IllegalArgumentException}.

         *     this method will throw an {@link IllegalArgumentException}. If the

         *     IpSecTunnelInterface is later added to this network, all outbound traffic will be

         *     blackholed.

         */

        // TODO: b/169171001 Update the documentation when transform migration is supported.

        // The purpose of making updating network and applying transforms separate is to leave open