Update changelogs from fern repo (#987)

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

Author: fern-support

fern/products/sdks/overview/java/changelog/2025-09-22.mdx

@@ -1,5 +1,5 @@
 ## 3.5.7
-**`(fix):`** Fixed NullPointerException in builder setters when collections are null by adding null checks before addAll()/putAll() calls.
+**`(fix):`** Fixed `NullPointerException` in builder setters when collections are null by adding null checks before `addAll()`/`putAll()` calls.
 
 
 ## 3.5.6

fern/products/sdks/overview/java/changelog/2025-09-24.mdx

@@ -1,4 +1,4 @@
 ## 3.5.9
-**`(fix):`** Fixed missing java.util.Optional import in dynamic snippets generation for wire tests.
+**`(fix):`** Fixed missing `java.util.Optional` import in dynamic snippets generation for wire tests.
 
 

fern/products/sdks/overview/java/changelog/2025-09-25.mdx

@@ -1,6 +1,6 @@
 ## 3.6.1
-**`(fix):`** Fixed wire tests failing with InvalidDefinitionException for Optional<T> serialization by using
-the configured ObjectMappers.JSON_MAPPER instead of plain ObjectMapper.
+**`(fix):`** Fixed wire tests failing with `InvalidDefinitionException` for `Optional<T>` serialization by using
+the configured `ObjectMappers.JSON_MAPPER` instead of plain `ObjectMapper`.
 
 
 ## 3.6.0