unify docs to use variable instead of variables

R/extract_list_of_variable_arrays.R

@@ -5,7 +5,7 @@
 #' \code{\link{extract_variable_array}}.
 #'
 #' @template args-methods-x
-#' @param variables A character vector of variable names to extract, or NULL to
+#' @param variable A character vector of variable names to extract, or NULL to
 #'   extract all variables. To extract all dimensions from variables with 
 #'   indices (e.g. \code{"x[1]"}), provide the base variable names 
 #'   (e.g. \code{"x"}).

R/variables.R

@@ -102,7 +102,7 @@ remove_reserved_variable_names <- function(variables, reserved) {
 #' @template args-methods-x
 #' @template args-methods-dots
 #' @template args-methods-with_indices
-#' @param value,variables (character vector) new variable names.
+#' @param value,variable (character vector) new variable names.
 #'
 #' @details
 #' `variables(x) <- value` allows you to modify the vector of variable names,