Update forecaster.py

[LiceyMaxim]

make_future_dataframe
Change description, removed unnecessary comments and operations

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[LiceyMaxim]

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[tcuongd]

It seems like the tests are failing. Could you take a look and see if it's related to your change? Thanks!

[LiceyMaxim]

@tcuongd Could you please check my pr?

[tcuongd]

Thanks, could you please update the description with what scenarios this would solve and the before/after? Or do you mainly just want to get rid of the inplace operation? I see you've also removed the dates = dates[:periods] line.