Prerun docs need to show how to put the option inside `sauce:options`

[diemol]

🐛 Bug Report

Have you read the Contributing Guidelines on issues?

• Yes

Description

This page https://docs.saucelabs.com/web-apps/automated-testing/selenium/pre-run-executables/, shows how to use prerun, but this code capabilities['prerun'] = 'http://location.of/curl.sh' is not W3C compliant. So we need to fix the examples to make that clear.

To Reproduce

Expected Behavior

Actual Behavior

Scripts and configuration needed to reproduce this issue (if applicable)

Your Environment

• OS:
• Node version:
• Docusaurus version:
• Browser version:

[diemol]

I'll assign this to myself and find some time to submit a PR.