DOC: incorrect formula for half-life of exponentially weighted window

[partev]

Pandas version checks

• I have checked that the issue still exists on the latest versions of the docs on main here

Location of the documentation

https://pandas.pydata.org/docs/dev/user_guide/window.html#exponentially-weighted-window

Documentation problem

in the documentation for alpha as a function of half-life the formula says 1-exp^(log(0.5)/h)

it should be either exp(log(0.5)/h) or e^(log(0.5)/h) but not exp^(log(0.5)/h)

Suggested fix for documentation

I suggest changing it to 1-e^(log(0.5)/h)