Add client-side detected secrets

❓ What does this MR do and why?

Add a table of detected secrets to the client-side secret detection bit of docs.

This doc covers the types exposed by secret_detection_patterns.js

📚 Related issues

Document patterns used by client-side secret de... (#471390 - closed)

👁 👃 👁 Review app

https://main-ee-159731.docs.gitlab-review.app/ee/user/application_security/secret_detection/client/detected_secrets.html