doc: restore REPLACEME on assert change

The change was semver-major and didn't land on v25.x

Refs: #60774
PR-URL: #60848
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Ulises Gascón <ulisesgascongonzalez@gmail.com>
Reviewed-By: Chemi Atlow <chemi@atlow.co.il>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: targos

doc/api/assert.md

@@ -342,7 +342,7 @@ An alias of [`assert.ok()`][].
 <!-- YAML
 added: v0.1.21
 changes:
-  - version: v25.1.0
+  - version: REPLACEME
     pr-url: https://github.com/nodejs/node/pull/58849
     description: Message may now be a `printf`-like format string or function.
   - version: v25.0.0