Update changelogs from fern repo (#427)

Co-authored-by: fearthecowboy <[email protected]>

Author: fern-support

fern/products/sdks/overview/csharp/changelog/2025-08-11.mdx

@@ -1,3 +1,6 @@
+## 2.1.10
+**`(fix):`** Generate reference.md file as long as there are some endpoints.
+
 ## 2.1.8
 **`(fix):`** Idempotent headers are added to the headers in the request