Feat/auto-regression and future values of past covariates documentation #4445

Job	Run time
check-examples (03-FFT-examples.ipynb)	5m 25s
check-examples (04-RNN-examples.ipynb)	8m 5s
docs	9m 31s
lint	51s
check-examples (00-quickstart.ipynb)	8m 45s
tests (macos-latest, 3.9, all)	42m 34s
check-examples (02-data-processing.ipynb)	9m 55s
tests (ubuntu-latest, 3.9, all)	40m 51s
check-examples (01-multi-time-series-and-covariates.ipynb)	7m 1s
	2h 12m 58s

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