docs(v2): Fix examples by importing React

[roydukkey]

Motivation

Code examples fail without import React from 'react';

Have you read the Contributing Guidelines on pull requests?

Yes

Test Plan

Tried implementing on my project with the copied code from docs. yarn start succeeded, but served blank screen.

Related PRs

Didn't find any.

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[netlify]

[V1] Deploy preview failure

Built without sensitive environment variables with commit 90b3f9c

https://app.netlify.com/sites/docusaurus-1/deploys/60385219f286b70007f00660

[roydukkey]

Not going to sign CLA. You're welcome to merge this or create a new PR with the same changes.

[github-actions]

Size Change: 0 B

Total Size: 532 kB

ℹ️ View Unchanged

Filename	Size	Change
website/build/assets/css/styles.********.css	87.1 kB	0 B
website/build/assets/js/main.********.js	359 kB	0 B
website/build/blog/2017/12/14/introducing-docusaurus/index.html	60.3 kB	0 B
website/build/docs/introduction/index.html	235 B	0 B
website/build/index.html	25.4 kB	0 B

_{compressed-size-action}

[netlify]

Deploy preview for docusaurus-2 ready!

Built without sensitive environment variables with commit 90b3f9c

https://deploy-preview-4297--docusaurus-2.netlify.app

[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🟢 Performance	91
🟢 Accessibility	96
🟢 Best practices	100
🟢 SEO	100
🟢 PWA	95

Lighthouse ran on https://deploy-preview-4297--docusaurus-2.netlify.app/classic/

[slorber]

Make sense thanks.

Can you please sign the CLA? (it's a FB legal requirement)

[facebook-github-bot]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Facebook open source project. Thanks!