[Docs] Render bug in website

[Araxeus]

Seems to happen because tab="file" isn't recognized and mess up the codeblock

electron-builder/docs/configuration/nsis.md

Line 134 in 0573808

```json tab="package.json"

---

https://www.electron.build/cli / https://github.com/electron-userland/electron-builder/blob/master/docs/cli.md

---

https://www.electron.build/auto-update / https://github.com/electron-userland/electron-builder/blob/master/docs/auto-update.md

---

https://www.electron.build/configuration/nsis / https://github.com/electron-userland/electron-builder/blob/master/docs/configuration/nsis.md