Curious about how to write vim help format txt.

I like vim help style, it has toc, tag support, nice alignment.

I know the syntax used in vim help, but I'm curious how the author to
generate toc, indent, align the whole help?

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Regards,
Yue Wu

Key Laboratory of Modern Chinese Medicines
Department of Traditional Chinese Medicine
China Pharmaceutical University
No.24, Tongjia Xiang Street, Nanjing 210009, China

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