Make v19.2 visible on Release Support Policy page#20761

rmloveland merged 3 commits intomaincockroachdb/docs:mainfrom

20251023-DOC-15195-list-19.2-in-unsupported-versionscockroachdb/docs:20251023-DOC-15195-list-19.2-in-unsupported-versionsCopy head branch name to clipboard