Update docs.yml

Author: humford

fern/docs.yml

@@ -147,7 +147,7 @@ navigation:
                 path: examples/pizza-website.mdx
               - page: Python Outbound Snippet
                 path: examples/outbound-call-python.mdx
-          - page: Billing
+          - page: Billing FAQ
             path: quickstart/billing.mdx
           - page: Code Resources
             path: resources.mdx