In docs/alternator/compatibility.md we said that although Alternator
supports authentication, it doesn't support authorization (access
control). Now it does, so the relevant text needs to be corrected
to fit what we have today.
It's still in the compatibility.md document because it's not the same
API as DynamoDB's, so users with existing applications may need to be
aware of this difference.
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
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