This is a small PR that adds a `.jsdoc` scope to JSDoc tokens, just like
[JSX](https://github.com/zed-industries/zed/blob/3fdbc3090d2cc5c2e24014009cccbe5e7c55d217/crates/languages/src/javascript/highlights.scm#L239)
has a specific scope.
This effectively allows differentiating between JavaScript keywords and
JSDoc tags in comments.

Release Notes:

  - Add scope for JSDoc