I'm not at all sure what you mean by 'typescript docs' in your comment. The protocol for things like tooltips/signature completion literally just says 'put arbitrary markdown here'. It doesn't proscribe the structure of the text the LSP author decides to use.

There are also many different display/view methods that more sophisticated LSP implementations can implement. In my own LSP, we have different 'views' of the signatures/types/docs for

* hovers * signature completion * detailed type-level embedded docs in a separate pane

to name a few. It's entirely customizable.