The "Terms and conditions" link in the footer of the About page (https://schema.org/docs/terms.html) points to the bad link https://schema.org/docs/%7B%7Bdocsdir%7D%7D/terms.html, which gives a 404 error. The correct link (https://schema.org/docs/terms.html) is present on the homepage. I've not checked any other pages to see if this issue exists on other pages.