Update changelogs from fern repo (#4577)

Co-authored-by: jsklan <100491078+jsklan@users.noreply.github.com>

Author: fern-support

fern/products/cli-api-reference/cli-changelog/2026-03-26.mdx

@@ -1,3 +1,13 @@
+## 4.46.3
+**`(fix):`** Fix OpenAPI-to-Fern conversion producing malformed discriminated union
+definitions when `x-fern-discriminator-context` is set. The context
+value was placed as a sibling of `discriminant` instead of being nested
+inside it, so the information was silently lost during IR generation.
+This caused generated SDKs to always use the default discriminator context
+of `data` and never use the alternate `protocol` which is used in SSE when
+the SSE envelope's event field is the discriminant.
+
+
 ## 4.46.2
 **`(fix):`** Fix Go SDK auto-versioning returning incorrect versions for modules with
 major version >= 2. The Go module proxy treats `github.com/owner/repo` and