Updated paths to UMD builds for React and React-DOM in 'How to Contribute' page

[tsairinius]

After building react (using either yarn build or yarn build react/index,react-dom/index --type=UMD), the resulting UMD builds no longer reside at build/dist/react.development.js and build/dist/react-dom.development.js, which is what is currently documented (see How to Contribute:

If you want to try your changes in your existing React project, you may copy build/dist/react.development.js, build/dist/react-dom.development.js, or any other build products into your app and use them instead of the stable version.

The builds now appear to be located at build/node_modules/react/umd/react.development.js and build/node_modules/react-dom/umd/react-dom.development.js. This PR updates the paths in the documentation.

Opened an issue for this: #3524

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[reactjs-bot]

Deploy preview for reactjs ready!

Built without sensitive environment variables with commit 19b06ba

https://deploy-preview-3523--reactjs.netlify.app

[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!

[rickhanlonii]

Awesome, thanks!