doc: fix doc metadata for Node.js 16.19.0

When cherry-picking the release commit for Node.js 16.19.0 to the `main`
branch git updated the metadata for the wrong item in `doc/api/test.md`.
The incorrectly updated item has been fixed in a subsequent commit (the
merge for the 19.3.0 release commit). This commit updates the intended
item that should have been updated when the 16.19.0 release commit was
merged.

Refs: nodejs#45506 (comment)
Refs: nodejs/Release#771

doc/api/test.md

@@ -1054,7 +1054,9 @@ set to `true`.
 ## Class: `TapStream`
 
 <!-- YAML
-added: v18.9.0
+added:
+  - v18.9.0
+  - v16.19.0
 -->
 
 * Extends {ReadableStream}