The code is underhttp://smalltalkhub.com/mc/Pharo/NativeBoost/main/ 
NativeBoost-Help-IgorStasenko.6 should do under 2.0.

Though there seems to be a problem since the original PetitParser repository
is down, hence, petit-markdown does not load anymore under 2.0. The newer
version of petit markdown which works under 3.0 uses slightly different nodes,
resulting in a broken NativeBoost-Help.

I short you can look at the code but not at the result :/