feat(shell/lean): error if leandoc is used with smt2 files
feat(shell/lean): error if leandoc is used with smt2 files

leanprover-community/lean,fgdorais/lean,avigad/lean,johoelzl/lean,leanprover-community/lean,rlewis1988/lean,rlewis1988/lean,digama0/lean,digama0/lean,leodemoura/lean,fpvandoorn/lean,fpvandoorn/lean,fgdorais/lean,fpvandoorn/lean,fgdorais/lean,Kha/lean,dselsam/lean,leanprover-community/lean,dselsam/lean,leanprover-community/lean,leodemoura/lean,fpvandoorn/lean,Kha/lean,avigad/lean,leodemoura/lean,fgdorais/lean,Kha/lean,fpvandoorn/lean,avigad/lean,leanprover/lean,dselsam/lean,avigad/lean,Kha/lean,fgdorais/lean,johoelzl/lean,digama0/lean,avigad/lean,digama0/lean,digama0/lean,digama0/lean,fpvandoorn/lean,johoelzl/lean,fgdorais/lean,leanprover/lean,rlewis1988/lean,leanprover-community/lean,rlewis1988/lean,leodemoura/lean,leanprover/lean,leodemoura/lean,leanprover-community/lean,avigad/lean,rlewis1988/lean,dselsam/lean,Kha/lean,leodemoura/lean,johoelzl/lean,johoelzl/lean,dselsam/lean,dselsam/lean,johoelzl/lean,leanprover/lean,rlewis1988/lean,Kha/lean,leanprover/lean,leanprover/lean