Update documentation for SSO Login

[chenj-hub]

Added the following steps for SSO Login:

1. Login as usual to https://learning.oreilly.com/
2. Open the developer tools with F12
3. Access the profile page in the browser: https://learning.oreilly.com/profile/
4. Enter command in console: copy(JSON.stringify(document.cookie.split(';').map(c => c.split('=')).map(i => [i[0].trim(), i[1].trim()]).reduce((r, i) => {r[i[0]] = i[1]; return r;}, {})))
5. Paste in cookie.json

[kenspirit]

Thanks for the tips. But should be cookies.json. :)