Update 2025-08-28.mdx

Author: tjb9dc

fern/products/cli-api-reference/cli-changelog/2025-08-28.mdx

@@ -1,5 +1,5 @@
 ## 0.66.31
-**`(fix):`** Ignore self-referential types that are optional<nullable<SELF>>
+**`(fix):`** Ignore self-referential types that are optional+nullable
 
 ## 0.66.30
 **`(fix):`** Skip OpenAPI 3.1 null type properties instead of failing