doc: add missing parameter types

Both of the `clearTimeout()` and `clearInterval()` functions in the
`timers` lib accepts the ID of the `Timeout` object returned by the
functions in a number or string type, e.g.

```js
const t = setTimeout(console.log, 5000, 'test');

clearTimeout(t[Symbol.toPrimitive]());
```

PR-URL: https://github.com/nodejs/node/pull/39013


Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>