Fix the broken "sales demo" links in the Product Marketing section.
This fixes the broken "sales demo" links at /handbook/marketing/product-marketing/demo/acs-setup/ and /handbook/marketing/product-marketing/demo/gke-setup/.
This fixes the broken "sales demo" links at /handbook/marketing/product-marketing/demo/acs-setup/ and /handbook/marketing/product-marketing/demo/gke-setup/.