[DF][NFC] Add doxygen docs for jitted Vary overloads
[DF][NFC] Add doxygen docs for jitted Vary overloads

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