faq: update apollo client cache suggestions

[alessbell]

This is based on the guidance we now give in our own documentation (source). I started by basically quoting the section wholesale but would be happy to adjust the language as needed :)

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[kettanaito]

This is fantastic! Thank you so much for contributing this!

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[kettanaito]

Hi, @alessbell 👋 I've made a few edits to your suggestions:

1. Removed the quote because it's Apollo-specific explanation. The developer can learn more by following the link to Apollo docs, which I moved under the code snippet to be consistent with how we use "Learn more" links in our docs.
2. Split the code snippet into two: the first one features the apollo-client.js, which is the same client you'd use in your app, keeping the makeClient so it's not a singleton. Then, another code snippet representing a test file, where makeClient is imported and a new Apollo client is constructed within the test block. This will help the developer orient where things are.

Let me know if those look okay to you! Once again, thank you for contributing this.

[alessbell]

@kettanaito ++ on those changes, looks great to me! Thanks for making those updates :)