Repair DAG diagram that was broken in #125

[Mr0grog]

It looks like an automated process destroyed one of the DAG diagrams in the balanced builder in #125. Specifically, it seems like gofmt didn’t really like this comment and reformatted it.

This restores the diagram and makes some slight changes so that gofmt won't break it again.

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[Mr0grog]

A line of text (that’s not indented with the list above it) appears to be required here. Otherwise, gofmt sees the diagram as part of the numbered list above, and indents and reformats it.

[Mr0grog]

Ping! This has been sitting for a few months. Just checking in here on whether I need to make any changes for this — it should only touch comments. (I think some automated tooling has rebased and added another commit; let me know if I should manually fix/rebase so it's a cleaner patch.)

[Jorropo]

This repository is no longer maintained and has been copied over to Boxo.
Please reopen this PR inside boxo/unixfs I'll merge it there thx. 🙂

You can learn more in the FAQs for the Boxo repo copying/consolidation effort.