It will only effect you if you have a CPT-onomy archive page enabled but, instead of entering your own custom archive page slug, you're leaving it blank and using the default archive page slug, which is '$post_type/tax/$term_slug'.
There was a typo where I stored the default value.
I wouldn't worry about it. Before you update, check your CPT-onomy "Archive Page Slug" properties and see if you have entered custom slugs. If you have, then you have no reason to worry.
If you left the "Archive Page Slug" blank, then I still wouldn't worry. Just check your pages after you update and, if they're not working, refresh your rewrite rules. If they're still not working, check your CPT-onomy properties again to make sure they're correctly defined. Refresh your rewrite rules and try again.