doc: fix typo in addons.md

"across version of Node.js" -> "across versions of Node.js"

PR-URL: nodejs#21137
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

doc/api/addons.md

@@ -224,7 +224,7 @@ illustration of how it can be used.
 N-API is an API for building native Addons. It is independent from
 the underlying JavaScript runtime (e.g. V8) and is maintained as part of
 Node.js itself. This API will be Application Binary Interface (ABI) stable
-across version of Node.js. It is intended to insulate Addons from
+across versions of Node.js. It is intended to insulate Addons from
 changes in the underlying JavaScript engine and allow modules
 compiled for one version to run on later versions of Node.js without
 recompilation. Addons are built/packaged with the same approach/tools