chore(library/type_context): replace `auto` with actual type
chore(library/type_context): replace `auto` with actual type

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