Tweak return val doc

Author: salim-b

R/remote.R

@@ -15,8 +15,8 @@
 #' @param sql_options `r lifecycle::badge("experimental")`
 #'   SQL rendering options generated by [sql_options()].
 #' @param ... Additional arguments passed on to methods.
-#' @return The value, or `NULL` if not remote table, or not applicable.
-#'    For example, computed queries do not have a "name"
+#' @return A string, or `NULL` if not a remote table, or not applicable.
+#'    For example, computed queries do not have a "name".
 #' @export
 #' @examples
 #' mf <- memdb_frame(x = 1:5, y = 5:1, .name = "blorp")