Fix bug in pooch example

[alessandrofelder]

Description

What is this PR

• Bug fix
• Addition of a new feature
• Other

Why is this PR needed?
pooch example is wrong AFAICT: it will download the GIN website contents showing file, not the contents of file.

What does this PR do?
Specifies the URL correctly in the pooch with GIN example.

References

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How has this PR been tested?

These fixtures work as expected (but the commented out line doesnt!)

@pytest.fixture(autouse=True, scope="session")
def brainglobe_test_registry():
    test_data = pooch.create(
        # Use the default cache folder for the operating system
        path=pooch.os_cache("brainglobe_test_data"),
        base_url="https://gin.g-node.org/BrainGlobe/test-data/raw/master/",
#      base_url="https://gin.g-node.org/BrainGlobe/test-data/src/master/",
        # The registry specifies the files that can be fetched
        registry={
            "cellfinder/cells-z-1000-1050.xml": None,
            "cellfinder/other-cells-z-1000-1050.xml": None,
        },
    )
    return test_data

@pytest.fixture
def cells(brainglobe_test_registry):
    cell_data_path = brainglobe_test_registry.fetch("cellfinder/cells-z-1000-1050.xml")
    cell_data = get_cells(cell_data_path)
    return cell_data

Is this a breaking change?

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Does this PR require an update to the documentation?

This is an update to the documentation.

Checklist:

• The code has been tested locally
• [] Tests have been added to cover all new functionality
• The documentation has been updated to reflect any changes
• The code has been formatted with pre-commit