AI 147290: Update Geocoder javadoc to reflect the need for a backend service.

 * reverse geocoded location description may vary, for example one

 * might contain the full street address of the closest building, while

 * another might contain only a city name and postal code. 

 *

 * The Geocoder class requires a backend service that is not included in

 * the core android framework. The Geocoder query methods will return an

 * empty list if there no backend service in the platform. 

 */

public final class Geocoder {

    private static final String TAG = "Geocoder";

     * @param longitude the longitude a point for the search

     * @param maxResults max number of addresses to return. Smaller numbers (1 to 5) are recommended

     *

     * @return a list of Address objects or null if no matches were

     * found.

     * @return a list of Address objects. Returns null or empty list if no matches were

     * found or there is no backend service available.

     *

     * @throws IllegalArgumentException if latitude is

     * less than -90 or greater than 90

     * @param locationName a user-supplied description of a location

     * @param maxResults max number of results to return. Smaller numbers (1 to 5) are recommended

     *

     * @return a list of Address objects or null if no matches were found.

     * @return a list of Address objects. Returns null or empty list if no matches were

     * found or there is no backend service available.

     *

     * @throws IllegalArgumentException if locationName is null

     * @throws IOException if the network is unavailable or any other

     * @param upperRightLatitude the latitude of the upper right corner of the bounding box

     * @param upperRightLongitude the longitude of the upper right corner of the bounding box

     *

     * @return a list of Address objects or null if no matches were found.

     * @return a list of Address objects. Returns null or empty list if no matches were

     * found or there is no backend service available.

     *

     * @throws IllegalArgumentException if locationName is null

     * @throws IllegalArgumentException if any latitude is