Improve documentation on panel widget option parameters.

[lhoupert]

It took me some times to find a way to edit a panel widget so the labels displayed are different from the attribute values.

Thanks to the discourse, I found a solution [here]

But I was wondering if this could not be more documented? For example, the Parameter docstring for the method .Select() give no information on the options parameter:

options:       < No docstring available >

I am happy to help (e.g. submit a PR), where is the best place to edit the docstring for the options parameters? explaining that a list of values or a dict {label:value} can be passed as an argument?

[MarcSkovMadsen]

Hi @lhoupert

Docs improvements sounds great. You can find the code here

https://github.com/holoviz/panel/blob/master/panel/widgets/select.py