dev(narugo): fix docs

"""

Overview:

    `Laplacian operator <https://en.wikipedia.org/wiki/Laplace_operator>`_-based blur check algorithm.

    Default recommended threshold is 100, lower than 100 means blur.

    .. note::

        **This algorithm seems work not well on anime blur cases**, so this function is just for a reference.

        We are exploring better algorithm for anime blur detection.

    .. image:: laplacian_full.plot.py.svg

        :align: center

    This is an overall benchmark of all the operations in laplacian algorithm:

    .. image:: laplacian_benchmark.plot.py.svg

        :align: center

"""

import cv2

import numpy as np