RobotFramework lexer: fix two instances of "return ValueError" instead of "raise ValueError".
RobotFramework lexer: fix two instances of "return ValueError" instead of "raise ValueError".

dbrgn/pygments-mirror,dbrgn/pygments-mirror,kirbyfan64/pygments-unofficial,kirbyfan64/pygments-unofficial,dbrgn/pygments-mirror,kirbyfan64/pygments-unofficial,kirbyfan64/pygments-unofficial,kirbyfan64/pygments-unofficial,dbrgn/pygments-mirror,dbrgn/pygments-mirror,dbrgn/pygments-mirror,kirbyfan64/pygments-unofficial,kirbyfan64/pygments-unofficial,dbrgn/pygments-mirror,dbrgn/pygments-mirror,kirbyfan64/pygments-unofficial,kirbyfan64/pygments-unofficial,dbrgn/pygments-mirror,dbrgn/pygments-mirror,kirbyfan64/pygments-unofficial,kirbyfan64/pygments-unofficial,kirbyfan64/pygments-unofficial,dbrgn/pygments-mirror,dbrgn/pygments-mirror,dbrgn/pygments-mirror,dbrgn/pygments-mirror,dbrgn/pygments-mirror,kirbyfan64/pygments-unofficial,dbrgn/pygments-mirror,kirbyfan64/pygments-unofficial,kirbyfan64/pygments-unofficial,kirbyfan64/pygments-unofficial