doc,test: update v8 method doc and comment

Update documentation and test comment for v8.cachedDataVersionTag().

PR-URL: https://github.com/nodejs/node/pull/35795


Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>