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どこかで見たな〜〜と思って今必死に探したらそれっぽいのが見つかりました。 https://developer.apple.com/library/archive/documentation/Xcode/Reference/xcode_markup_formatting_ref/index.html#//apple_ref/doc/uid/TP40016497-CH2-SW1
Describes the markup formatting language used for creating rich playgrounds, documenting swift code, and adding developer symbols to QuickHelp.