--- upgrade: - | The `extract_swift_flags.py` script has been removed, and the `autohelp.py` and `diff_branches.py` scripts no longer build config file documentation for the swift project. The swift dev team had been manually maintaining their config files in-tree and to avoid duplication, doc and swift have agreed to link the config ref out to the dev docs. As such, there is therefore no reason to keep this tooling around.