Improve Quick Info with reStructuredText

[lmariscal]

Loving the extesion, just thought that since Nim docgen uses reStructuredText to parse the markup in the code comments it would be useful to have it in the quick info panel.

Also the quick info panel doesn't show the documentation in var, const or let types.

I would love to make a PR but have no experience making vscode extensions. Great work nonetheless 👍

[kosz78]

Documentation is provided by nimsuggest ide tools, and it dont provide documentation for var, const and let. I guess You need address Your request to https://github.com/nim-lang/nimsuggest project

I have added markdown support for completion documentation, it will be available in next release