FIX Fix a bug that comment of the arrow function in the interface is not rendered

[ryanking13]

This fixes a bug while I was working on pyodide/pyodide#5746.

I noticed that a docstring of a property inside an interface that has arrow function is not rendered in the docs.

For example,

interface MyInterface {
  /**
    * This should be rendered
    */
  prop: () => void;
}

The docstring "This should be rendered" is not rendered in the docs.

[hoodmane]

Thanks!

[ryanking13]

Thanks for the review!