Add new 3.x branches to documentation config#552

Bouncheck merged 1 commit intoscylladb:scylla-4.xscylladb/java-driver:scylla-4.xfrom

Bouncheck:scylla-4.x-docs-add-new-3.x-branchesBouncheck/java-driver:scylla-4.x-docs-add-new-3.x-branchesCopy head branch name to clipboard