contract walkthru out-of-date w.r.t. dapp-offer-up

[dckc]

for example, docs say:

documentation/snippets/zoe/contracts/test-bundle-source.js

Line 20 in 6ef2085

const contractPath = myRequire.resolve(`../src/gameAssetContract.js`);

but the dapp says:

const contractPath = myRequire.resolve(`../src/offer-up.contract.js`);

https://github.com/Agoric/dapp-offer-up/blob/4debeb9f616905f195b1590ba8ce8b91735a8082/contract/test/test-bundle-source.js#L15