docs: add missing import statement

[skoyah]

The current Beta documentation shows a code snippet a little different from the one available in the Sandbox.

It seems that the React import is missing from the documentation.

Steps to reproduce:

• Fork the first code sandbox that appears on the tutorial on the "Tutorial Setup" section (https://beta.reactjs.org/learn/tutorial-tic-tac-toe#setup-for-the-tutorial)

This PR fixes the documentation to be in sync with the sandbox example.

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[github-actions]

Size Changes

📦 Next.js Bundle Analysis

This analysis was generated by the next.js bundle analysis action 🤖

This PR introduced no changes to the javascript bundle 🙌

[harish-sethuraman]

These react imports might not be needed 🤔. constantly throughout the documentation we don't have react imported I guess.

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[skoyah]

I come from Vueland and is my first contact with React. Started following the tutorial and encountered this "error".

[harish-sethuraman]

It should work even if we remove the import of React in the codesandbox and it should be fine.

[shaonkabir8]

It's great and working fine with several tests ...
keep it up mate @skoyah

[skoyah]

So perhaps we should remove it from the sandbox itself?

Having that import statement does not add anything.

Beginners might even wonder why is there in the first place.