Use isSuccess when loading

[mikerowehl]

Using isLoading for Wagmi state can show the value before the hook starts the network request. The other recipes look to already account for that and they use isPending. isSuccess is great for this simple read case, as it only goes to true if the value has been loaded successfully.

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[mikerowehl]

Rebased on top of the vocs changes to update the way the code highlighting is done. The vocs update looks to have also added a few pairs of curly braces to the final example showing the loading state, which made it inconsistent with the view of the whole example at the top of the page. I believe that version might have actually been syntactically invalid. I think this version should clean that up, but I'm not sure if there was something else that was trying to work around. Let me know if it doesn't render correctly. I'm seeing what looks like a good version when I do a preview locally.