doc(node): add `KernelModulesLoaded` node condition

[mantissahz]

Which issue(s) this PR fixes:

Issue # longhorn/longhorn#9153

What this PR does / why we need it:

Special notes for your reviewer:

Additional documentation or context

[netlify[bot]]

✅ Deploy Preview for longhornio ready!

Name	Link
🔨 Latest commit	ac51447f7701512fe9090b7862cf625660cd9bde
🔍 Latest deploy log	https://app.netlify.com/sites/longhornio/deploys/66fbb8631b0f4e0008079087
😎 Deploy Preview	https://deploy-preview-995--longhornio.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 site configuration.