CLIMATE-241 - Update plotter.py docstring formatting

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[MJJoyce]

If @agoodm could take a look and make sure all of this reads alright I would be super appreciative :)

Also, @agoodm, I noticed that the subregion function specifies that it needs "subregion objects." Do we document what exactly that means somewhere or was there a different assumption being made when this was done?

[agoodm]

@MJJoyce

👍 To the actual changes. I actually liked that you clarified a few of the parameters by adding links to relative matplotlib and basemap documentation too.

Regarding the draw_subregions function, the "subRegion" object refers to the class inside the rcmet/src/main/python/rcmes/classes.py module, which I believe is what we used for subregion parsing in the past. The equivalent to this in the refactoring branch is probably ocw.dataset.Bounds.

[MJJoyce]

Cheers @agoodm!