[internal] Fix use of ellipses

[oliviertassinari]

Finish the work from #3633 (comment) (I have 5 other PRs open across the codebase 😁).

1. Fix a few more ... to …
2. Remove … for the multi-select to be consistent with the other demos on the page https://base-ui.com/react/components/select.

There is a larger discussion on whether we want to change the current standard: placeholders have no … to match with https://vercel.com/design/guidelines#placeholders-signal-emptiness. However, Vercel's UI or Shadcn UI is not even following this. Overall, it feels like we should stick to the current practice: avoid … whenever it's redundant, only for:

• There is an action in progress
• There is another action to take, and that is not very obvious from the other clues.

Similar assets:

• https://developer.apple.com/design/human-interface-guidelines/menus#Labels:~:text=commands%20it%20contains.-,Append%20an%20ellipsis,-to%20a%20menu
• https://learn.microsoft.com/en-us/windows/win32/uxguide/cmd-menus#using-ellipses
• https://m3.material.io/foundations/content-design/style-guide/grammar-and-punctuation#20caa5d9-e816-4bea-8cc9-85c97b606ceb

[mui-bot]

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@base-ui/react	0B(0.00%)	0B(0.00%)

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  pnpm add https://pkg.pr.new/mui/base-ui/@base-ui/utils@4445
  

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[colmtuite]

Placeholders are not supposed to signal emptiness. The best way to signal emptiness, is to have an empty input. Placeholders are intended to provide a clue about the expected data format or type. Therefore, an ellipsis is hardly ever appropriate in a placeholder.

Placeholders don't make sense in Select. Since placeholders are intended to provide a clue about the expected data format or type, they only make sense when there is user-generated input. Select doesn't support user-generated input, so placeholders are redundant. ARIA guides advise against using placeholders as a prompt.

So, I'll merge this but it's just moving food around the plate. There are a lot of mistakes throughout the docs.