Document the behavior of OR — it doesn't work with column filters

[PaulRBerg]

References:

• https://github.com/graphprotocol/graph-node/issues/6040
• https://github.com/graphprotocol/graph-node/issues/6041

[PaulRBerg]

It appears that it is possible to nest an or object under an and:

where: {
  and: [
    { age_gt: 21 },
    {
      or: [
        { status: "active" },
        { status: "review" },
      }
    }
  }
}