improve upscaling example

[DirkEilander]

Issue addressed

Fixes #72

Explanation

Explain how you addressed the bug/feature request, what choices you made and why.

Checklist

• Updated tests or added new tests
• Branch is up to date with main
• Updated documentation if needed
• Updated CHANGELOG.rst if needed

Additional Notes (optional)

Add any additional notes or information that may be helpful.

[Copilot]

Pull Request Overview

Enhance the upscaling example notebook by adding steps to persist upscaled outputs, correct a typo, and align notebook metadata.

• Added cells to save the upscaled flow direction raster and vector network files
• Fixed spelling in a markdown comment ("contributing")
• Updated notebook kernelspec display name and Python version in metadata

Comments suppressed due to low confidence (2)

examples/upscaling.ipynb:37

• [nitpick] Consider renaming prof to profile for clarity and consistency with rasterio naming conventions.

    "    prof = src.profile\n",

examples/upscaling.ipynb:169

• This cell references the variable s outside its original loop context, which may be undefined or only retain its last value. Wrap this save operation inside the same loop over s or explicitly define s to ensure files are named correctly for each scale.

    "with rasterio.open(f\"rhine_d8_upscale{s}.tif\", \"w\", **prof) as src:\n",

[Copilot]

Avoid using a hard-coded nodata value like 247. Consider using the original dataset's nodata value (e.g., prof['nodata'] or src.nodata) to maintain consistency and avoid magic numbers.

Suggested change

	" nodata=247,\n",
	" nodata=prof.get('nodata', 247),\n",