docs: add a little info to Configuration class description

 * This class describes all device configuration information that can

 * impact the resources the application retrieves.  This includes both

 * user-specified configuration options (locale and scaling) as well

 * as dynamic device configuration (various types of input devices).

 * as device configurations (such as input modes, screen size and screen orientation).

 * <p>You can acquire this object from {@link Resources}, using {@link

 * Resources#getConfiguration}. Thus, from an activity, you can get it by chaining the request

 * with {@link android.app.Activity#getResources}:</p>

 * <pre>Configuration config = getResources().getConfiguration();</pre>

 */

public final class Configuration implements Parcelable, Comparable<Configuration> {

    /**