Document that checking a bool property in querybuilder will always result in `true`

[raddevon]

If you check the boolean value of a property in JavaScript (without using e.op or similar), the result will always be truthy since that is not the value in the data but an object that is part of the query builder which itself is always truthy.

// 🚫
const products = await e.select(e.Product, (product) => ({
  token_amount: product.show_token_amount ? true: false
})).run(client);

// ✅
const products = await e.select(e.Product, (product) => ({
    token_amount: e.op(product.token_amount, "if", product.show_token_amount, "else", e.int32(0)),
}).run(client);

Context: https://discord.com/channels/841451783728529451/849374705210490900/1080892880526262283