Fix typos in the HMR and Fast Refresh section of the 10up-toolkit readme

[marcoluzi]

Is your enhancement related to a problem? Please describe.

Fixing syntax error in the README.md of the 10up-toolkit package.

10up-toolkit/packages/toolkit/README.md

Line 293 in 5846b93

```

Fixed Code:

const config = require('10up-toolkit/config/webpack.config.js');
const fs = require('fs');

// Customize this to the appropriate path to your certificate folder
const certPath = '/Users/youruser/.config/valet';

// Check if devServer is in use and if so, modify the cert files used
if( typeof config.devServer === 'object' ) {
  config.devServer.https = {
    key: fs.readFileSync(`${certPath}/Certificates/yoursite.test.key`),
    cert: fs.readFileSync(`${certPath}/Certificates/yoursite.test.crt`),
    ca: fs.readFileSync(`${certPath}/CA/LaravelValetCASelfSigned.pem`),
  }
}

module.exports = config;

I will open a PR with the changes.

Designs

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