Replace debug-test in documentation

[awells111]

Summary

yarn debug-test is now deprecated in React package.json. It has been replaced by yarn test --debug.

How did you test this change?

I've tried in both a bash console and in powershell and the result that I get from yarn debug-test is

Please run: `'yarn` instead.

From searching please run: in the repo, I found that on line 352 of scripts\jest\jest-cli.js there is the below code

  if (argv.deprecated) {
    console.log(chalk.red(`\nPlease run: \`${argv.deprecated}\` instead.\n`));
    return;
  }

I think that it's supposed to output Please run: 'yarn test --debug' but it's getting truncated, which is another problem that I can open an issue for pending the merge of this issue.

When I run yarn test --debug there are no issues and I can debug the application as expected.

[sizebot]

Comparing: 2c7dea73659da283fa433f5fd657a5a29797fd67...7a2d1211b36a113f1137d1c067db4eee89b04a4d

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable/react-dom/cjs/react-dom.production.min.js	=	132.92 kB	132.92 kB	=	42.68 kB	42.68 kB
oss-experimental/react-dom/cjs/react-dom.production.min.js	=	138.15 kB	138.15 kB	=	44.19 kB	44.19 kB
facebook-www/ReactDOM-prod.classic.js	=	469.02 kB	469.02 kB	=	84.22 kB	84.22 kB
facebook-www/ReactDOM-prod.modern.js	=	454.26 kB	454.26 kB	=	81.98 kB	81.98 kB
facebook-www/ReactDOMForked-prod.classic.js	=	469.02 kB	469.02 kB	=	84.22 kB	84.22 kB

Significant size changes

Includes any change greater than 0.2%:

(No significant changes)

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