urlchecker::url_check() and related fixes

Author: jennybc

R/check-mac.R

@@ -1,7 +1,7 @@
 #' Check a package on macOS
 #'
 #' Check on either the released or development versions of R, using
-#' <https://mac.r-project.org/macbuilder/>.
+#' <https://mac.r-project.org/macbuilder/submit.html>.
 #'
 #'
 #' @template devtools

R/vignettes.R

@@ -15,8 +15,7 @@
 #'   vignettes.
 #' @param keep_md If `TRUE`, move md intermediates as well as rendered
 #'   outputs. Most useful when using the `keep_md` YAML option for Rmarkdown
-#'   outputs. See
-#'   <https://bookdown.org/yihui/rmarkdown/html-document.html#keeping-markdown>.
+#'   outputs.
 #' @inheritParams tools::buildVignettes
 #' @inheritParams remotes::install_deps
 #' @importFrom stats update