File nesting: setting hover swallows `$(capture)`

Testing #141354

Open the hover in the JSON settings

![image](https://user-images.githubusercontent.com/6461412/151004787-d1da19b2-ed36-40ea-ac2c-452da22471f2.png)

Note the "``". It should say `$(capture)` which needs to be escaped as this is the syntax of codicons.