Fix up some comments in IPv6 tethering code.

                // We need to be able to send unicast RAs, and clients might

                // like to ping the default router's link-local address.  Note

                // that we never remove the link-local route from the network

                // until Tethering disables tethering on the interface.

                // until Tethering disables tethering on the interface. We

                // only need to add the link-local prefix once, but in the

                // event we add it more than once netd silently ignores EEXIST.

                addedPrefixes.add(LINK_LOCAL_PREFIX);

            }

                final ArrayList<RouteInfo> toBeAdded = getLocalRoutesFor(addedPrefixes);

                try {

                    // It's safe to call addInterfaceToLocalNetwork() even if

                    // the interface is already in the local_network.

                    // the interface is already in the local_network. Note also

                    // that adding routes that already exist does not cause an

                    // error (EEXIST is silently ignored).

                    mNMService.addInterfaceToLocalNetwork(mIfName, toBeAdded);

                } catch (RemoteException e) {

                    Log.e(TAG, "Failed to add IPv6 routes to local table: ", e);

        for (Inet6Address dns : dnses) {

            // NOTE: If the full of list DNS servers doesn't fit in the packet,

            // this code will cause a buffer overflow and the RA won't include

            // include this instance of the option at all.

            // this instance of the option at all.

            //

            // TODO: Consider looking at ra.remaining() to determine how many

            // DNS servers will fit, and adding only those.