docs: Updated formatting toolbar buttons example

[matthewlipski]

This PR updates the example for adding formatting toolbar buttons. A common use case is to show/hide a button based on the selected block, so the custom button in the example is now hidden for blocks without inline content, as it has no funciton there anyway.

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Name	Status	Preview	Updated (UTC)
blocknote	✅ Ready (Inspect)	Visit Preview	Aug 4, 2025 10:47pm
blocknote-website	❌ Failed (Inspect)		Aug 4, 2025 10:47pm

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commit: 7538c5e