Update 2025-10-23.mdx (#1427)

Author: chdeskur

fern/products/sdks/overview/java/changelog/2025-10-23.mdx

@@ -1,6 +1,6 @@
 ## 3.9.2
 **`(fix):`** Fix nullable field serialization in PATCH requests with wrapped request bodies. Explicit null values
-(Nullable.ofNull()) are now correctly serialized as {"field": null} instead of being omitted like
+(Nullable.ofNull()) are now correctly serialized as `{"field": null}` instead of being omitted like
 Nullable.empty().