Premature doc on exogenous variables in VARIMA

[robjhyndman]

fable/R/VARIMA.R

Line 114 in a6e07e1

#' Exogenous regressors can be included in an VARIMA model without explicitly using the `xreg()` special. Common exogenous regressor specials as specified in [`common_xregs`] can also be used. These regressors are handled using [stats::model.frame()], and so interactions and other functionality behaves similarly to [stats::lm()].

But

fable/R/VARIMA.R

Line 6 in a6e07e1

cli::cli_abort("Exogenous regressors for VARIMA are not yet supported.")

Reported at https://github.com/orgs/OTexts/discussions/123