doc: record forbidOnly option addition

Refs: #66578

Assisted-by: a coding agent
Signed-off-by: João Victor <joao.oliveira@softtor.com.br>

Author: joao-oliveira-softtor

doc/api/test.md

@@ -1712,6 +1712,9 @@ added:
   - v18.9.0
   - v16.19.0
 changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/66578
+    description: Added the `forbidOnly` option.
   - version:
      - v26.2.0
      - v24.19.0