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Re:How GitHub Uses GitHub to Document GitHub by NhanH on Tuesday January 06, 2015 @09:14PM (#8848493)
Isn't what you describe (documentation first, then code) basically a poor man version of literate programming ;) ?
Re:How GitHub Uses GitHub to Document GitHub by conorgil145 on Wednesday January 07, 2015 @05:58PM (#8853905)
I wasn't familiar with the term, but a quick search reveals Literate Programming on Wikipedia [1]. I assume that is what you were referencing. I skimmed the summary of the article and it sounds interesting (and similar to what I'm describing).

[1] https://en.wikipedia.org/wiki/Literate_programming