Fix a double dash in the previewer if an @param jsdoc tag has a hyphen after the param name

[coolreader18]

Here are some screenshots of the problem. The WIP tsdoc spec allows a hyphen after the param name, and I believe jsdoc does as well. This would cause a double dash if the description was a single line (— -), and a bullet point if it were multiple lines because of markdown.

Resolves #53507.

[roblourens]

Is there an issue for this?

[coolreader18]

#2387, maybe, but that's been closed.

[mjbvz]

@coolreader18 Please create a new issue to tie this PR to.

Also add a simple test case in https://github.com/Microsoft/vscode/blob/master/extensions/typescript-language-features/src/test/jsdocSnippet.test.ts

You can run this test using the TypeScript Extension Tests launch.json config in VS Code

[mjbvz]

Can you also please add a simple test case for this

[msftclas]

All CLA requirements met.

[mjbvz]

Thanks! This change will be in the next VS Code insiders build