docs: add useEffectEvent to the sidebar menu

[MatanBobi]

This PR adds the experimental_useEffectEvent page to the API reference menu.
As this hook is being referenced in the learn section but the page wasn't visible in the menu (while other new experimental hooks are in the menu), it seemed like this hook is not planned anymore. Adding it to the menu states that this API is something the React core team aims to ship.

I'd love to expand the content in another PR if you all believe this will help.

Thanks for all your hard work! :)

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Name	Status	Preview	Updated (UTC)
react-dev	✅ Ready (Inspect)	Visit Preview	Feb 16, 2024 11:35am

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Size changes

📦 Next.js Bundle Analysis for react-dev

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One Page Changed Size

The following page changed size from the code in this PR compared to its base branch:

Page	Size (compressed)	First Load
/[[...markdownPath]]	81.45 KB (🟡 +13 B)	185.31 KB

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[rickhanlonii]

Hey, sorry for the confusion, I didn't realize this was the page you were suggesting. We may be making some changes to this API before it lands so let's wait to add this page until it's closer to final.

[MatanBobi]

Oh, no worries, thanks @rickhanlonii!