New review comment by ahesford on void-packages repository

https://github.com/void-linux/void-packages/pull/27300#discussion_r546454163

Comment:
Even if they are scripts, if you expect the user to modify them and you don't want to clobber them with every update, use `conf_files` instead of `mutable_files`. Files listed in `mutable_files` are still replaced during upgrades and removed when a package is removed, but XBPS ignores changes to the files when evaluating package integrity. Files listed in `conf_files` are removed or replaced if and only if their contents have not been changed by the user since installation time.