Exclude the docs (and examples) from the published package, please

SSIA; Ref and request from https://github.com/home-assistant/core/pull/155255#discussion_r2465303385:

> I really don't think it's a good idea to add a requirements exception.
This is used to track "existing" violations, not to enable new violations to come in.
>
> You should raise an issue on aiomysql repository to ask them to remove the docs from the published package.
>
> Possibly linked to `tool.setuptools.packages.find`:
>
> https://github.com/aio-libs/aiomysql/blob/72a4df674ae5466028f2b762917f938813bb147d/pyproject.toml#L60-L61