docs: personal-files interface doesn't connect
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Issue body
### Check existing issues
- [x] I've verified that this request isn't described by any existing issues.
### Request
The `personal-files` interface isn't actually connected in the tutorial snap:
```bash
$ snap connections ukuzama-pyfiglet
Interface Plug Slot Notes
home ukuzama-pyfiglet:home :home -
personal-files ukuzama-pyfiglet:dot-pyfiglet-fonts - -
```
## Environment
Snapcraft 8.14.5
SnapD 2.75.2
### Document location
https://documentation.ubuntu.com/snapcraft/latest/tutorials/craft-a-snap
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