Update src/content/docs/billing/billing-policy.mdx

Co-authored-by: Jun Lee <[email protected]>

Author: dcpena

src/content/docs/billing/billing-policy.mdx

@@ -105,5 +105,5 @@ For assistance, visit our [Support Portal](https://support.cloudflare.com/hc/en-
 ## Related resources
 
 * [Cloudflare Self-Serve Subscription Agreement](https://www.cloudflare.com/terms/)
-* [Understanding Cloudflare Invoices](https://developers.cloudflare.com/fundamentals/subscriptions-and-billing/understand-invoices/)
-* [Understanding Cloudflare sales tax](https://developers.cloudflare.com/support/account-management-billing/understanding-cloudflare-sales-tax/)
+* [Understanding Cloudflare Invoices](/fundamentals/subscriptions-and-billing/understand-invoices/)
+* [Understanding Cloudflare sales tax](/billing/sales-tax/)