Update changelogs from fern repo (#539)

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

Author: fern-support

fern/products/sdks/overview/go/changelog/2025-08-20.mdx

@@ -1,3 +1,7 @@
+## 1.6.1
+**`(feat):`** Add reference.md doc generation
+
+
 ## 1.6.0
 **`(feat):`** Add support for specifying a custom subdirectory to generate into.