Update changelogs from fern repo (#916)

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

Author: fern-support

fern/products/cli-api-reference/cli-changelog/2025-09-09.mdx

@@ -11,8 +11,8 @@
 
 
 ## 0.72.0
-**`(feat):`** Introduces `group-multi-api-environments` flag for multi-API environment support. SDKs can now handle 
-multiple API products with per-environment base URLs, featuring automatic environment grouping and 
+**`(feat):`** Introduces `group-multi-api-environments` flag for multi-API environment support. SDKs can now handle
+multiple API products with per-environment base URLs, featuring automatic environment grouping and
 service-aware URL routing.
 
 

fern/products/cli-api-reference/cli-changelog/2025-09-22.mdx

@@ -1,3 +1,6 @@
+## 0.78.4
+**`(fix):`** Collapse any combination of optional and nullable to optional<nullable<T>>.
+
 ## 0.78.3
 **`(chore):`** Support IR v59 in the Rust SDK generator.