Replace renamed reference to NetworkStats in javadoc

import dalvik.system.CloseGuard;

/**

 * Class providing enumeration over buckets of network usage statistics. NetworkUsageStats objects

 * Class providing enumeration over buckets of network usage statistics. {@link NetworkStats} objects

 * are returned as results to various queries in {@link NetworkStatsManager}.

 */

public final class NetworkStats implements AutoCloseable {

    private final static String TAG = "NetworkUsageStats";

    private final static String TAG = "NetworkStats";

    private final CloseGuard mCloseGuard = CloseGuard.get();