Always use a list for Params and Raises in API docs

[Eric-Arellano]

Sphinx does not use an unordered list <ul> if there is only a single element:

Compare that to:

We think it would be more readable if we always used a bullet list, even when there is only one element:

This is the path forward for adding indentation, #736.

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This change should happen in the API conversion script, rather than the web app. That is, the change should happen in the children of the <Function> component, rather than the component itself making this transformation. We would update processHtml.ts to convert single values into a <ul> with one <li>.

This should be done for Params, Raises, probably Yields, and probably more of https://sphinxcontrib-napoleon.readthedocs.io/en/latest/#docstring-sections. But it should not be added to everything. For example, return type should not have indentation since it never has >1 element.