Update the createWithCache docs to warn about caching errors

[blittle]

WHY are these changes introduced?

In the createWithCache callback, if the user does not throw when a 3p request fails, the result will be cached. This PR adds a warning to the docs.

HOW to test your changes?

Guide changes - https://shopify-dev.shopify-dev-68tf.bret-little.us.spin.dev/docs/storefronts/headless/hydrogen/data-fetching/third-party#step-1-create-a-new-third-party-api-client
Reference docs changes - https://shopify-dev.shopify-dev-68tf.bret-little.us.spin.dev/docs/api/hydrogen/2024-07/utilities/caching/createwithcache

Post-merge steps

Checklist

• I've read the Contributing Guidelines
• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've added a changeset if this PR contains user-facing or noteworthy changes
• I've added tests to cover my changes
• I've added or updated the documentation

[github-actions]

We detected some changes in packages/*/package.json or packages/*/src, and there are no updates in the .changeset.
If the changes are user-facing and should cause a version bump, run npm run changeset add to track your changes and include them in the next release CHANGELOG.
If you are making simple updates to examples or documentation, you do not need to add a changeset.

[shopify]

Oxygen deployed a preview of your bl-fix-3p-docs branch. Details:

Storefront	Status	Preview link	Deployment details	Last update (UTC)
third-party-queries-caching	✅ Successful (Logs)	Preview deployment	Inspect deployment	July 26, 2024 9:03 PM
metaobjects	✅ Successful (Logs)	Preview deployment	Inspect deployment	July 26, 2024 9:03 PM
classic-remix	✅ Successful (Logs)	Preview deployment	Inspect deployment	July 26, 2024 9:03 PM
optimistic-cart-ui	✅ Successful (Logs)	Preview deployment	Inspect deployment	July 26, 2024 9:03 PM
Skeleton (skeleton.hydrogen.shop)	✅ Successful (Logs)	Preview deployment	Inspect deployment	July 26, 2024 9:03 PM
custom-cart-method	✅ Successful (Logs)	Preview deployment	Inspect deployment	July 26, 2024 9:03 PM

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