Hover documentation for JSX (like for HTML)

[mlntr]

Upon hover, elements and attributes in HTML files display a small documentation window with the HTML info. This can be useful as a reminder.

JSX should have this too, as it'd be more helpful than what is currently displayed.

Currently this is displayed (JSX):

This could be augmented or replaced with the HTML info. Suggestion:

[mjbvz]

Related to #44204

[RyanCavanaugh]

This is already supported, it's just that the React definition files don't provide these comments.

declare var React: any;
namespace JSX {
  export interface IntrinsicElements {
    /**
     * Is a neat thing
     */
    thing: any;
  }
}
// Works on hover
const p = <thing></thing>;

[typescript-bot]

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