Update cheatsheets

tldr/brew-cleanup

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# brew cleanup
+
+> Remove stale lock files and outdated downloads for all formulas and casks.
+> More information: <https://docs.brew.sh/Manpage#cleanup-options-formulacask->.
+
+- Remove stale lock files and outdated downloads for all formulas/casks:
+
+`brew cleanup`
+
+- Remove stale lock files and outdated downloads for a specific formula/cask:
+
+`brew cleanup {{formula|cask}}`
+
+- Show what would be removed, but do not actually remove anything:
+
+`brew cleanup {{[-n|--dry-run]}}`
+
+- Display help:
+
+`brew cleanup {{[-h|--help]}}`