All other commands document both `--dry-run` and `-n` in the option
description and mention only `--dry-run` in the command summary. Let's
do the same for `cleanup`.
ClosesHomebrew/homebrew#46942.
Signed-off-by: Martin Afanasjew <martin@afanasjew.de>
This is the (partially) documented public API for Homebrew.
The main class you should look at is the {Formula} class (and classes linked from there). That's the class that's used to create Homebrew formulae (i.e. package descriptions). Assume anything else you stumble upon is private.