Documentation is missing the `Emitter` class
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Issue body
### Bug Description
The auto-generated documentation doesn't contain documentation for the `Emitter` class.
### To Reproduce
https://canonical-craft-cli.readthedocs-hosted.com/en/latest/search/?q=Emitter&check_keywords=yes&area=default
### part yaml
```shell
```
### Relevant log output
```shell
n/a
```
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