Revert "[SE-0328] Update status: "Implemented (Swift 5.6)"" (#1507)
Revert "[SE-0328] Update status: "Implemented (Swift 5.6)"" (#1507)

This reverts commit 7fbe15f8285fbd15117a34d11eb5c58fd3de3fd4. The
proposal has not yet been fully implemented.
apple/swift-evolution,abertelrud/swift-evolution,apple/swift-evolution,natecook1000/swift-evolution,abertelrud/swift-evolution,natecook1000/swift-evolution