[menu][docs] Fix detached triggers sample

[chuganzy]

This PR fixes a very minor error in the Menu doc.

• I have followed (at least) the PR section of the contributing guide.

[pkg-pr-new]

• vite-css-base-ui-example

  pnpm add https://pkg.pr.new/mui/base-ui/@base-ui/react@3589
  

  pnpm add https://pkg.pr.new/mui/base-ui/@base-ui/utils@3589
  

commit: 317477d

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[atomiks]

The quotes here seem weird as well, could adjust these to remove the quotes:

const menus = {
  'file': ['New', 'Open', 'Save'],
  'edit': ['Undo', 'Redo', 'Cut', 'Copy', 'Paste'],
}

...

items: menus['file']
items: menus['edit']

[mui-bot]

Bundle size report

Bundle	Parsed size	Gzip size
@base-ui/react	0B(0.00%)	0B(0.00%)

Details of bundle changes

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[oliviertassinari]

CircleCI failing https://app.circleci.com/pipelines/github/mui/base-ui/18429/workflows/708b87e2-dca2-4aa0-9551-465165a3640f

looked like an intermittent bug with them. CircleCI context and sharing permissions with forks looks correct.