a new version is available in archives can be upgraded via the package
menu produced by 'M-x list-packages'. If you do set this option
non-nil, we recommend not to use the 'U' command, but instead to use
-'/ u' to show the packages which can be upgraded, and then unmark the
-built-in packages which you don't need to overwrite from the archives.
+'/ u' to show the packages which can be upgraded, and then decide
+which ones of them you actually want to update from the archives.
If you customize this option, we recommend you place its non-default
setting in your early-init file.