DOC: Clearer coordinate docstring for `open_rasterio` #1217

Job	Run time
linting	11s
Test latest dependencies	21s
Docker \| GDAL=3.8.2 \| python=3.10 \| rasterio \| scipy YES	3m 34s
ubuntu-latest \| 3.10 \| rasterio-* \| scipy YES	1m 52s
Docker \| GDAL=3.8.2 \| python=3.11 \| rasterio \| scipy YES	3m 40s
ubuntu-latest \| 3.11 \| rasterio-* \| scipy YES	1m 35s
Docker \| GDAL=3.8.2 \| python=3.12 \| rasterio \| scipy YES	3m 51s
ubuntu-latest \| 3.12 \| rasterio-* \| scipy YES	1m 39s
Docker \| GDAL=3.6.4 \| python=3.10 \| rasterio \| scipy YES	3m 39s
macos-13 \| 3.10 \| rasterio-* \| scipy YES	1m 40s
Docker \| GDAL=3.7.3 \| python=3.10 \| rasterio \| scipy NO	3m 49s
macos-13 \| 3.11 \| rasterio-* \| scipy YES	1m 39s
macos-13 \| 3.12 \| rasterio-* \| scipy YES	1m 39s
windows-latest \| 3.10 \| rasterio-* \| scipy YES	1m 38s
windows-latest \| 3.11 \| rasterio-* \| scipy YES	1m 38s
windows-latest \| 3.12 \| rasterio-* \| scipy YES	1m 38s
	34m 3s

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