Packaging tutorial: Directory structure unclear

[gunnarvoet]

The guide puts __init__.py and refraction.py directly into src/

cookie/docs/pages/tutorials/packaging.md

Lines 53 to 58 in 7250955

	```bash
	touch src/__init__.py
	```
	Place `refraction.py`, our code from the previous section, next to it, at
	`src/refraction.py`.

whereas the directory structure listing has src/example/...

cookie/docs/pages/tutorials/packaging.md

Lines 90 to 95 in 7250955

	.
	├── pyproject.toml
	├── src
	│ └── example
	│ ├── __init__.py
	│ └── refraction.py

[henryiii]

Oops, that’s a mistake. __init__.py should never be directly in src.