added to index

Author: ramsrib

fern/docs.yml

@@ -172,6 +172,9 @@ navigation:
               - page: Built-in call tools
                 path: tools/default-tools.mdx
                 icon: fa-light fa-gear
+              - page: Voicemail tool
+                path: tools/voicemail-tool.mdx
+                icon: fa-light fa-voicemail
               - page: Custom tools
                 path: tools/custom-tools.mdx
                 icon: fa-light fa-screwdriver-wrench