Feat/auto-regression and future values of past covariates documentation #4470

Job	Run time
tests (macos-latest, 3.9, all)	50m 0s
docs	9m 9s
lint	37s
tests (ubuntu-latest, 3.9, all)	30m 26s
check-examples (03-FFT-examples.ipynb)	5m 48s
check-examples (04-RNN-examples.ipynb)	10m 13s
check-examples (00-quickstart.ipynb)	10m 25s
check-examples (02-data-processing.ipynb)	6m 26s
check-examples (01-multi-time-series-and-covariates.ipynb)	7m 9s
	2h 10m 13s

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