The previous patches added a somewhat misleading comment in front of
system:initial_tablets, which this patch improves.
That tag is NOT where Alternator "stores" table properties like the
existing comment claimed. In fact, the whole point is that it's the
opposite - Alternator never writes to this tag - it's a user-writable
tag which Alternator *reads*, to configure the new table. And this is
why it obviously can't be hidden from the user.
Signed-off-by: Nadav Har'El <nyh@scylladb.com>