update docs for bngd features

[khorne3]

Thanks for improving Semgrep Docs 😀

Please ensure

• [ ] A subject matter expert (SME) reviews the content
• [ ] A technical writer reviews the content or PR
• [ ] This change has no security implications or else you have pinged the security team
• [ ] Redirects are added if the PR changes page URLs
• [ ] If you have changed any header tag links (doc/#this-kind-of-anchor), update all instances of that link

[netlify[bot]]

✅ Don't forget to add /docs at the end of the deploy preview site URL!

Name	Link
🔨 Latest commit	5bd3adf645825cacee1ad971a744cfa0d91aeb21
🔍 Latest deploy log	https://app.netlify.com/projects/semgrep-docs-prod/deploys/6932dd67f3353600083971e3
😎 Deploy Preview	https://deploy-preview-2355--semgrep-docs-prod.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[jsmoxon]

@khorne3 I don't see anything about the new "provisionally ignored" status. Am I just missing it? Let me know if you want me to provide a write up of what it is and how it works.

[khorne3]

@jsmoxon This was a WIP that I put on pause for a bit, so it doesn't have the provisionally ignored status info. If you could provide a write-up, that would be great. Thank you!