docs: Broken link in batch documentation

[prk3]

I would like to report an issue in page https://cpp-driver.docs.scylladb.com/master/topics/basics/batches/index

Problem

The document contains a link (url: http://www.datastax.com/documentation/cql/3.1/cql/cql_using/useBatch.html) that leads to datastax homepage.

Also, "edit this page" button redirects to github 404 page.

Suggest a fix

The link should probably point to https://docs.datastax.com/en/astra-cql/doc/cql/cql_using/useBatch.html.