Add uuid to changelog

Author: colinhacks

packages/docs/content/v4/changelog.mdx

@@ -320,6 +320,14 @@ z.string().email(); // ❌ deprecated
 z.email(); // ✅ 
 ```
 
+### stricter `.uuid()`
+
+The `z.uuid()` now validates UUIDs more strictly against the RFC 4122 specification; specifically, the variant bits must be `10` per the spec. For a more permissive "UUID-like" validator, use `z.guid()`.
+
+```ts
+z.uuid(); // RFC 4122 compliant UUID
+z.guid(); // any 8-4-4-4-12 hex pattern
+```
 
 ### no padding in `.base64url()`