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b0e4a914 - docs: Restore webpack loader documentation under "Customizing Turbopack" (#3829)

docs: Restore webpack loader documentation under "Customizing Turbopack" (#3829) This restores documentation for webpack loaders and resolve aliases under a new page, "Customizing Turbopack". This page is now linked to under a new section in "Migrating from Webpack". **Do not merge until Next 13.2 lands**