Update algorithm.rst

.. role:: raw-math(raw)

    :format: latex html

SLS pipeline

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ERR数据单元构造误差数据，该步误差公式：

.. math::

\begin{displaymath}

v = {\sigma}_1 \cdot {\sigma}_2

\end{displaymath}

:raw-math:`$$ \sigma = \sqrt{(SCI-bias)+{\sigma_bias}^2 + readnoise^2)} $$`

\sigma = \sqrt{((SCI-bias)+\sigma^2 + readnoise^2)}

**Dark correction**