doc(doc/changes): add missing features/changes
doc(doc/changes): add missing features/changes

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