The description of extended Props is not output correctly

I created FooProps by extending BarProps, but the description of FooProps is not used; instead, the description of BarProps is adopted.

Input

export interface BarProps {
  /** BarProps param1 */
  param1: any;
}

export interface FooProps extends BarProps {
  /** FooProps param1 */
  param1: string;
  /** FooProps param2 */
  param2: string;
}

export const Foo = (props: FooProps) => {
  return <div>foo</div>;
};

output

{
  "./src/foo.tsx": [
    {
      "description": "",
      "methods": [],
      "displayName": "Foo",
      "props": {
        "param1": {
          "required": true,
          "tsType": {
            "name": "string"
          },
          "description": "BarProps param1"
        },
        "param2": {
          "required": true,
          "tsType": {
            "name": "string"
          },
          "description": "FooProps param2"
        }
      }
    }
  ]
}

The props.param1.description should be "FooProps param1" instead of "BarProps param1".

Tested on @react-docgen/cli@3.0.0

Start by reproducing the TypeScript example with @react-docgen/cli@3.0.0 and inspect how descriptions are chosen for inherited props. Trace the extended Props handling and add a regression test for the FooProps/BarProps case. Done means param1 uses "FooProps param1" while inherited and other prop descriptions remain correct.