[NFC][DF] Promote some code comments to doxygen comments
[NFC][DF] Promote some code comments to doxygen comments

olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root