docs(guide/deferred): Fixed code highlights in details element

[DigitalNaut]

"useAsyncValue" hook alternative example code was missing its highlights.

I tried my best to keep it consistent with the other examples but please review!

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[machour]

Hi @DigitalNaut and thank you for opening this PR!

I gave it a thorough look, and I think I'd do [11, 16, 23-31] instead to highlight things like this:

We would be just highlighting the changes from the previous code, while still highlighting the useDataLoader()

What do you think?

[DigitalNaut]

I think you're right, I like that better. I've updated the commit with your suggestion instead.