Remove empty code cell in examples/multidimensional-coords.ipynb

[kmuehlbauer]

• Closes Error in examples/multidimensional-coords.html #8722

[kmuehlbauer]

@keewis Sorry to bother you, are the checks not running by design when changing only docs? Otherwise this little fix is good to go.

[keewis]

I think so, yes. Look at the rules at the top of the workflow definition:

xarray/.github/workflows/ci.yaml

Lines 9 to 15 in 447e5a3

	paths:
	- "ci/**"
	- ".github/**"
	- "/*" # covers files such as `pyproject.toml`
	- "/.*" # ...and dotfiles in the root such as `.pre-commit-config.yaml`
	- "properties/**"
	- "xarray/**"

This excludes anything in /doc.

In any case, since this simply removes an empty cell I'll go ahead and merge.

[kmuehlbauer]

@keewis Thanks for the explanation!