[PATCH v3 1/3] dts: rewrite README

[Dean Marx]

> Also, I never did get a response from you about whether it would be good to include some ascii art to depict these topologies :)
>
> You don't have to be a fan, but it would be good to get your opinion. If you think it's a good idea, can you add a bugzilla ticket so we can do this during 25.11? If you're opposed I'm okay with it - ultimately the wording should make the valid topologies clear enough to people. It's not something we can add during RC4 in any case.

I like the idea of some ASCII art to illustrate the documentation
better, I'll make that Bugzilla ticket so we can add it in the next
release.