But Arch is a popular shortcut for Arch Linux and it is possible that this would appear later. It would be more appropriate to deal with this now instead of doing it again and again.
That's done, thanks for bringing this up!
updating post history, 16 rows affected updating posts, 16 rows affected updating PostTags associations, 13 rows affected removing/renaming old tag, 0 rows affected updating count for master tag, 1 rows affected tag remapping of [arch-linux] and [arch] complete! remapping 0 synonyms 5 favorite and ignored tags remapped!