Fix/update doc (#2091)

* fix: link to models table

* fix: VARIMA supports probabilistic forecast

* fix: naive model support multivariate series

* fix: removed link to unexisting section of the install.md, removed typo

* fix: use split_after to make example more coherent

* fix: adressing review comment, link to static covariate notebook and model table

* fix: more specific comment in example notebook