Update package manager documentation.

     * {@link #addPreferredActivity}, that are

     * currently registered with the system.

     *

     * @param outFilters A list in which to place the filters of all of the

     * preferred activities, or null for none.

     * @param outActivities A list in which to place the component names of

     * all of the preferred activities, or null for none.

     * @param packageName An option package in which you would like to limit

     * @param outFilters A required list in which to place the filters of all of the

     * preferred activities.

     * @param outActivities A required list in which to place the component names of

     * all of the preferred activities.

     * @param packageName An optional package in which you would like to limit

     * the list.  If null, all activities will be returned; if non-null, only

     * those activities in the given package are returned.

     *

     * (the number of distinct IntentFilter records, not the number of unique

     * activity components) that were found.

     */

    public abstract int getPreferredActivities(List<IntentFilter> outFilters,

            List<ComponentName> outActivities, String packageName);

    public abstract int getPreferredActivities(@NonNull List<IntentFilter> outFilters,

            @NonNull List<ComponentName> outActivities, String packageName);

    /**

     * Ask for the set of available 'home' activities and the current explicit