acp: Suggest upgrading to preview instead of latest (#36648)

A previous PR changed the install command from `@latest` to `@preview`,
but the upgrade command kept suggesting `@latest`.

Release Notes:

- N/A
9a3e4c47d0Agus Zubiaga committed on 8/21/2025, 12:52:38 AM· committed by GitHubparent568e1d0
1 file changedLine totals unavailable