docs: fix master config doc typo

[jgongd]

Ticket

Description

Test Plan

Checklist

• [ ] Changes have been manually QA'd
• [ ] User-facing API changes need the "User-facing API Change" label.
• [ ] Release notes should be added as a separate file under docs/release-notes/. See Release Note for details.
• [ ] Licenses should be included for new code which was copied and/or modified from any external code.

[netlify[bot]]

✅ Deploy Preview for determined-ui ready!

Name	Link
🔨 Latest commit	0f75edb9c74118dc2c258a8890a4ba0a4f13e122
🔍 Latest deploy log	https://app.netlify.com/sites/determined-ui/deploys/662bf6812ee83a000864129d
😎 Deploy Preview	https://deploy-preview-9256--determined-ui.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.