update changelogs

Author: tstanmay13

fern/products/sdks/overview/java/changelog/2025-10-28.mdx

@@ -1,3 +1,9 @@
+## 3.10.0
+**`(feat):`** Add support for three-state nullable fields in PATCH requests via `use-nullable-for-optional-fields` config.
+When enabled, optional fields use `Nullable<T>` instead of `Optional<T>` to distinguish between
+omitted fields, explicit null values, and actual values.
+
+
 ## 3.9.4
 **`(chore):`** Documenting `.withRawResponse()` in `README.md`.