Merge "Update javaDoc to make it consistent"

/**

 * Describes specific properties of a requested network for use in a {@link NetworkRequest}.

 *

 * Applications cannot instantiate this class by themselves, but can obtain instances of

 * subclasses of this class via other APIs.

 * This as an abstract class. Applications shouldn't instantiate this class by themselves, but can

 * obtain instances of subclasses of this class via other APIs.

 */

public abstract class NetworkSpecifier {

    /**

     * Create a placeholder object. Please use subclasses of this class in a {@link NetworkRequest}

     * to request a network.

     */

    public NetworkSpecifier() {}

    /**