Code comments in examples?

[dt-rush]

It would probably massively improve the value of the examples if they had comments.

I'd be interested in taking on some of this work and could create pull requests to be reviewed.

What motivated me to file this issue is actually a somewhat separate question, though, which I'd also appreciate clarification on while anybody reading is reading:

In the render_goroutines example, I'm not quite sure I understand the use of a mutex lock around running = false, since the mutex is not used anywhere else, so what is it really preventing? I'm writing a project in Go to learn it better so there's probably something I'm missing. Either way code comments could have made the example much richer.

[veeableful]

That's a good idea @dt-rush. The project always needs more improvements so PRs are always welcome and appreciated. Improving the examples is a nice start!