Typo for `variables` arg API docstring in `xarray.core.Dataset.sortby`

[tomvothecoder]

What is your issue?

Just something I caught while looking at the docs. I think this should be variables?

xarray/xarray/core/dataset.py

Line 7925 in d639d6e

variables: Hashable

xarray/xarray/core/dataset.py

Lines 7948 to 7953 in d639d6e

	Parameters
	----------
	kariables : Hashable, DataArray, sequence of Hashable or DataArray, or Callable
	1D DataArray objects or name(s) of 1D variable(s) in coords whose values are
	used to sort this array. If a callable, the callable is passed this object,
	and the result is used as the value for cond.

[max-sixty]

Thanks — a small PR would be v welcome!

[tomvothecoder]

@max-sixty Just opened in #8670