Invalid escape sequence in docstring

[jl-wynen]

There are invalid escape sequences in a docstring here: https://github.com/EasyScience/EasyScience/blob/a6d93795c396eb2c843d162908d636cbfe4e8a36/src/easyscience/Datasets/xarray.py#L284 Namely \|.

To fix it, either use \\| or make the docstring a raw string literal.

Normally, this only raises a DeprecationWarning which often does not show up in the terminal. But in our tests, we treat warnings as errors. This makes Python raise SyntaxError here.

[AndrewSazonov]

Fixed in #90