fixed simulations description to match v2 and added advanced

Author: Noah Raynor

fern/docs.yml

@@ -295,6 +295,9 @@ navigation:
               - page: Quickstart
                 path: observability/simulations-quickstart.mdx
                 icon: fa-light fa-rocket
+              - page: Advanced
+                path: observability/simulations-advanced.mdx
+                icon: fa-light fa-flask-vial
           - page: Boards
             path: observability/boards-quickstart.mdx
             icon: fa-light fa-chart-line