The steps for finding missing interfaces with `snappy-debug` started with running it, without mentioning that it's a snap that has to be installed first. This adds the install step, and a meta description for the page. The issue also mentions that the "Debugging snaps" link at the end of the page pointed back to the page itself. That's already fixed on `main`: the section now links to the debugging guide in the snapd documentation. Fixes #5726 --- - [x] I've followed the [contribution guidelines](https://github.com/canonical/snapcraft/blob/main/CONTRIBUTING.md). - [x] I've signed the [CLA](http://www.ubuntu.com/legal/contributors/). - [x] I've successfully run `make lint && make test`. - [x] I've added or updated any relevant documentation. - [x] In documents I changed, I [added a meta description](https://canonical-starflow.readthedocs-hosted.com/how-to/add-a-page-meta-description/) if one was missing. - [ ] I've updated the relevant release notes.