In the state of Alternator in docs/alternator/alternator.md, we said that BatchWriteItem doesn't check for duplicate entries. That is not true - we do - and we even have tests (test_batch_write_duplicate*) to verify that. So drop that comment. Refs #5698. (there is still a small bug in the duplicate checking, so still leaving that issue open). Signed-off-by: Nadav Har'El <nyh@scylladb.com> Message-Id: <20200219164107.14716-1-nyh@scylladb.com>