test(lua): add some comments to inductive datatype test
test(lua): add some comments to inductive datatype test

Signed-off-by: Leonardo de Moura <7610bae85f2b530654cc716772f1fe653373e892@microsoft.com>

dselsam/lean,sp3ctum/lean,UlrikBuchholtz/lean,Kha/lean,soonhokong/lean-windows,UlrikBuchholtz/lean,soonhokong/lean,javra/lean,eigengrau/lean,Kha/lean,fpvandoorn/lean,levnach/lean,leodemoura/lean,dselsam/lean,sp3ctum/lean,htzh/lean,leodemoura/lean,leanprover-community/lean,soonhokong/lean,htzh/lean,digama0/lean,dselsam/lean,UlrikBuchholtz/lean,soonhokong/lean-osx,avigad/lean,leodemoura/lean,leanprover-community/lean,c-cube/lean,leodemoura/lean,digama0/lean,soonhokong/lean-osx,rlewis1988/lean,Kha/lean,fpvandoorn/lean2,digama0/lean,leanprover-community/lean,c-cube/lean,htzh/lean,sp3ctum/lean,leanprover-community/lean,leanprover/lean,c-cube/lean,leanprover/lean,dselsam/lean,sp3ctum/lean,fgdorais/lean,eigengrau/lean,htzh/lean,leanprover/lean,leanprover/lean,digama0/lean,leanprover/lean,soonhokong/lean-windows,fpvandoorn/lean2,johoelzl/lean,Kha/lean,soonhokong/lean,UlrikBuchholtz/lean,leanprover-community/lean,javra/lean,eigengrau/lean,Kha/lean,avigad/lean,soonhokong/travis_test,levnach/lean,soonhokong/travis_test,fgdorais/lean,avigad/lean,fgdorais/lean,avigad/lean,fgdorais/lean,javra/lean,eigengrau/lean,fpvandoorn/lean,levnach/lean,sp3ctum/lean,johoelzl/lean,rlewis1988/lean,soonhokong/travis_test,leodemoura/lean,c-cube/lean,leodemoura/lean,digama0/lean,htzh/lean,soonhokong/lean,fpvandoorn/lean2,soonhokong/lean,rlewis1988/lean,fgdorais/lean,johoelzl/lean,c-cube/lean,fgdorais/lean,johoelzl/lean,soonhokong/travis_test,fpvandoorn/lean2,dselsam/lean,digama0/lean,levnach/lean,johoelzl/lean,eigengrau/lean,javra/lean,Kha/lean,soonhokong/lean-osx,leanprover/lean,johoelzl/lean,avigad/lean,rlewis1988/lean,fpvandoorn/lean,UlrikBuchholtz/lean,soonhokong/lean-windows,javra/lean,avigad/lean,soonhokong/lean-osx,rlewis1988/lean,fpvandoorn/lean,fpvandoorn/lean2,soonhokong/lean-windows,soonhokong/lean-windows,soonhokong/lean-osx,dselsam/lean,levnach/lean,fpvandoorn/lean,fpvandoorn/lean,rlewis1988/lean,leanprover-community/lean