Document paths plot

[MarcSkovMadsen]

I'm trying to improve the docstrings of hvplot. I cannot find any documentation for hvPlot.paths. https://hvplot.holoviz.org/search.html?q=paths

I believe something should be available in the Reference Gallery https://hvplot.holoviz.org/reference/index.html

[maximlt]

hvplot.paths are mentioned in https://hvplot.holoviz.org/user_guide/Geographic_Data.html but indeed this plot type doesn't have a reference gallery, and deserves one.