doc(doc/lean): lexical conventions
doc(doc/lean): lexical conventions

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

codyroux/lean0.1,soonhokong/lean-windows,htzh/lean,avigad/lean,fgdorais/lean,johoelzl/lean,fgdorais/lean,soonhokong/lean-windows,leanprover/lean,leanprover-community/lean,johoelzl/lean,fpvandoorn/lean2,codyroux/lean0.1,sp3ctum/lean,soonhokong/lean-osx,soonhokong/lean-osx,dselsam/lean,fpvandoorn/lean,htzh/lean,soonhokong/lean-osx,fpvandoorn/lean2,johoelzl/lean,c-cube/lean,leodemoura/lean,htzh/lean,fgdorais/lean,javra/lean,javra/lean,digama0/lean,dselsam/lean,htzh/lean,UlrikBuchholtz/lean,leanprover/lean,leanprover/lean,fpvandoorn/lean2,leanprover-community/lean,avigad/lean,leanprover-community/lean,UlrikBuchholtz/lean,soonhokong/lean-osx,rlewis1988/lean,rlewis1988/lean,rlewis1988/lean,fpvandoorn/lean,codyroux/lean0.1,Kha/lean,soonhokong/travis_test,leodemoura/lean,fpvandoorn/lean,leodemoura/lean,javra/lean,eigengrau/lean,c-cube/lean,johoelzl/lean,c-cube/lean,fgdorais/lean,soonhokong/lean,codyroux/lean0.1,dselsam/lean,digama0/lean,avigad/lean,leodemoura/lean,Kha/lean,eigengrau/lean,sp3ctum/lean,UlrikBuchholtz/lean,fpvandoorn/lean,digama0/lean,levnach/lean,soonhokong/lean,UlrikBuchholtz/lean,soonhokong/travis_test,soonhokong/lean-windows,soonhokong/lean-osx,htzh/lean,Kha/lean,soonhokong/travis_test,levnach/lean,soonhokong/travis_test,fgdorais/lean,soonhokong/lean-windows,digama0/lean,fgdorais/lean,leodemoura/lean,sp3ctum/lean,rlewis1988/lean,fpvandoorn/lean,Kha/lean,c-cube/lean,leanprover/lean,rlewis1988/lean,sp3ctum/lean,leanprover/lean,johoelzl/lean,soonhokong/lean,levnach/lean,dselsam/lean,leanprover/lean,leodemoura/lean,digama0/lean,leanprover-community/lean,fpvandoorn/lean2,dselsam/lean,soonhokong/lean,Kha/lean,rlewis1988/lean,leanprover-community/lean,soonhokong/lean-windows,dselsam/lean,javra/lean,UlrikBuchholtz/lean,eigengrau/lean,avigad/lean,digama0/lean,levnach/lean,leanprover-community/lean,javra/lean,fpvandoorn/lean2,levnach/lean,Kha/lean,johoelzl/lean,avigad/lean,fpvandoorn/lean,c-cube/lean,soonhokong/lean,avigad/lean,eigengrau/lean,eigengrau/lean,sp3ctum/lean