docs: equations of exponential smoothing models don't render correctly #1088
Description
Description
I noticed that in the rendered doc of the exponential smoothing models, the latex equations which defines those models don't render correctly.
Looking at the docstring in the source code (ex: class SimpleExponentialSmoothing(_TS)), I don't spot an immediate syntax error
Still, comparing with class HistoricAverage(_TS): I see that in that docstring, equations are given in a "triplequote math" block, while in SimpleExponentialSmoothing, it uses the "inline dollar syntax".
Link
doc of the SimpleExponentialSmoothing constructor https://nixtlaverse.nixtla.io/statsforecast/src/core/models.html#simpleexponentialsmoothing → equation is displayed as "hatyt+1=alphayt+(1−alpha)hatyt−1"
for the contrast, with HistoricAverage, equation is rendered correctly: https://nixtlaverse.nixtla.io/statsforecast/src/core/models.html#historicaverage