Fix mention of 'ARIMA' regressors in non-ARIMA functions

.Rbuildignore

@@ -16,3 +16,4 @@ Makefile
 ^Meta$
 ^.github$
 ^\.lintr$
+^CRAN-RELEASE$

NEWS.md

@@ -1,5 +1,9 @@
 # fable (development version)
 
+## Improvements
+
+* Documentation improvements.
+
 # fable 0.3.1
 
 Small release to resolve check issues with the development and patched versions 

R/ar.R

@@ -28,7 +28,7 @@
 #' }
 #'
 #' \subsection{xreg}{
-#' Exogenous regressors can be included in an ARIMA 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()].
+#' Exogenous regressors can be included in an AR 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()].
 #'
 #' The inclusion of a constant in the model follows the similar rules to [`stats::lm()`], where including `1` will add a constant and `0` or `-1` will remove the constant. If left out, the inclusion of a constant will be determined by minimising `ic`.
 #'

R/lm.R

@@ -115,7 +115,7 @@ specials_tslm <- new_specials(
 #' @section Specials:
 #'
 #' \subsection{xreg}{
-#' Exogenous regressors can be included in an ARIMA 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()].
+#' Exogenous regressors can be included in a TSLM 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()].
 #' \preformatted{
 #' xreg(...)
 #' }

R/var.R

@@ -141,7 +141,7 @@ specials_var <- new_specials(
 #' }
 #'
 #' \subsection{xreg}{
-#' Exogenous regressors can be included in an ARIMA 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()].
+#' Exogenous regressors can be included in an VAR 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()].
 #'
 #' The inclusion of a constant in the model follows the similar rules to [`stats::lm()`], where including `1` will add a constant and `0` or `-1` will remove the constant. If left out, the inclusion of a constant will be determined by minimising `ic`.
 #'