Block preview - help with docs

Hello. I’m interested in creating a plugin for a custom block. I’m reviewing the docs, this page. See screen shot from page.

What is the your-project/button-block bit? I understand I would change that to my specific info, but I’m not sure what that’s all about. It’s a path from where to what?

Please advise.

Thats “developername/plugin-name”, see also

Got it. Thanks!