chore: rename "Web integration" to "Web calls" (#469)

Author: goosewin

fern/docs.yml

@@ -101,7 +101,7 @@ navigation:
           - page: Phone calls
             icon: fa-solid fa-phone
             path: quickstart/phone.mdx
-          - page: Web integration
+          - page: Web calls
             icon: fa-light fa-browser
             path: quickstart/web.mdx
           - section: How Vapi works