Update FINGERPRINT_ERROR_VENDOR documentation

    /**

     * Hardware vendors may extend this list if there are conditions that do not fall under one of

     * the above categories. Vendors are responsible for providing error strings for these errors.

     * These messages are typically reserved for internal operations such as enrollment, but may be

     * used to express vendor errors not covered by the ones in fingerprint.h. Applications are

     * expected to show the error message string if they happen, but are advised not to rely on the

     * message id since they will be device and vendor-specific

     */

    public static final int FINGERPRINT_ERROR_VENDOR = 8;