[Docs] Update migration guide docs for deprecation of message (#5595)

* feature: update migration guide docs for deprecation of message

* Tweak

---------

Co-authored-by: Colin McDonnell <colinmcd94@gmail.com>

Author: alysakowski

packages/docs/content/v4/changelog.mdx

@@ -34,9 +34,9 @@ Many of Zod's behaviors and APIs have been made more intuitive and cohesive. The
 
 Zod 4 standardizes the APIs for error customization under a single, unified `error` param. Previously Zod's error customization APIs were fragmented and inconsistent. This is cleaned up in Zod 4. 
 
-### deprecates `message`
+### deprecates `message` parameter
 
-Replaces `message` with `error`. The `message` parameter is still supported but deprecated.
+Replaces `message` param with `error`. The old `message` parameter is still supported but deprecated.
 
 <Tabs groupId="error-message" items={["Zod 4", "Zod 3"]} persist>
 <Tab value="Zod 4">