Apply suggestion from @sfanahata

Link to what the performance score is.

Author: sfanahata

docs/product/dashboards/sentry-dashboards/nextjs.mdx

@@ -31,7 +31,7 @@ The **Client Transactions** table lists browser-side transactions grouped by ope
 | `ui.interaction.click` | Click interactions |
 | `ui.interaction.press` | Press interactions |
 
-Each row shows views, error rate, average and P95 duration, and a performance score where applicable.
+Each row shows views, error rate, average and P95 duration, and a [performance score](/product/insights/frontend/web-vitals/) where applicable.
 
 ## Server Transactions