docs: fix broken links utility + uncaught broken links (#12637)

* fix broken links

* update broken links utility

* add missing payment evens

* generate llms

* fix segment link

www/apps/book/app/learn/customization/customize-admin/route/page.mdx

@@ -12,7 +12,7 @@ In this chapter, you'll add a UI route to the admin dashboard that shows all [br
   items={[
     {
       text: "Brands Module",
-      link: "/learn/customization/custom-features/modules"
+      link: "/learn/customization/custom-features/module"
     },
   ]}
 />