added new user-impact doc to navigation file

Author: WriteMayur

src/nav/browser.yml

@@ -92,6 +92,8 @@ pages:
         path: /docs/browser/new-relic-browser/guides/guide-to-monitoring-core-web-vitals
       - title: Page views page
         path: /docs/browser/new-relic-browser/browser-pro-features/page-views-examine-page-performance
+      - title: User impact page
+        path: /docs/browser/new-relic-browser/browser-pro-features/user-impact
       - title: AJAX page
         path: /docs/browser/browser-monitoring/browser-pro-features/ajax-page-identify-time-consuming-calls
       - title: Errors (errors inbox)