Update changelogs from fern repo (#812)

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

Author: fern-support

fern/products/sdks/overview/typescript/changelog/2025-09-08.mdx

@@ -0,0 +1,18 @@
+## 2.11.0
+**`(feat):`** Generate `Request` and `Response` types variations for types that have readonly and/or writeonly properties.
+For example, a type `User` will have a `User.Request` type that omits readonly properties and a `User.Response` type that omits writeonly properties.
+
+Set `generateReadWriteOnlyTypes` to `true` in the `config` of your generator configuration to enable this feature.
+```ts
+import { User, FooClient } from "foo";
+
+const client = new FooClient(...);
+const createUser: User.Request = {
+  name: "Jon",
+  // id: "123", // Error: id is read-only and thus omitted
+};
+const createdUser: User.Response = await client.createUser(createUser);
+// createdUser.id is available here
+```
+
+