Remove write_sas mention from read_sas doc (#767)

Author: szimmer

R/haven-sas.R

@@ -23,7 +23,6 @@
 #'   Variable labels are stored in the "label" attribute of each variable. It is
 #'   not printed on the console, but the RStudio viewer will show it.
 #'
-#'   `write_sas()` returns the input `data` invisibly.
 #' @export
 #' @examples
 #' path <- system.file("examples", "iris.sas7bdat", package = "haven")