Aside from the necessity of the comments, I notice they have many comment blocks that are to the right of the code block, but left-aligned to some column number

Aside from the necessity of the comments, I notice they have many comment blocks that are to the right of the code block, but left-aligned to some column number. Is this easy in some editor? I can't imagine doing this in vim without some extra fanciness in the vimrc, for example.