docs: document resolved chat classification in Ask Fern analytics (#4979)

Co-authored-by: fern-api[bot] <115122769+fern-api[bot]@users.noreply.github.com>
Co-authored-by: Devin Logan <devinannlogan@gmail.com>

Author: fern-api[bot]

fern/products/docs/pages/ask-fern/what-is-ask-fern.mdx

@@ -65,7 +65,9 @@ Ask Fern comes with built-in tools to help you understand how users interact wit
 
 <AccordionGroup>
 <Accordion title="Analytics">
-View queries and conversations per day in the [Fern Dashboard](http://dashboard.buildwithfern.com). Drill down into individual conversations and export data to CSV.
+View conversations per day in the [Fern Dashboard](http://dashboard.buildwithfern.com), drill down into individual conversations, and export to CSV.
+
+The Dashboard also reports a **resolution rate** over the last week, month, or year — the percentage of conversations where Ask Fern returned a cited response. Conversations where the assistant can't find relevant information count as unresolved.
 </Accordion>
 <Accordion title="Deep linking">
 You can open Ask Fern ([example](https://buildwithfern.com/learn/home?searchType=ai&query=custom+header)) or the search dialog ([example](https://buildwithfern.com/learn/home?query=custom+header)) directly from a URL using query parameters. This is useful for linking from a help chat widget, support portal, or onboarding flow.