You’re right mikeywazowski.
Thanks for sharing how you fixed yours! It fixed mine, too.
I didn’t have to revert to old storefront version.
Website is no longer showing this error after I changed line 11 in my child theme header.php file from
<html <?php language_attributes(); ?> <?php storefront_html_tag_schema(); ?>>
to
<html <?php language_attributes(); ?>>
It’s just a readme txt file. Don’t worry. It is safe to delete it.
