Markdown links with styled text are parsed incorrectly

Given 2 links:

```md
[Link to Foo](https://example.com)

[Link to `Foo`](https://example.com)
```

RDoc can't handle the 2nd case:

<img width="163" alt="Screenshot 2024-12-12 at 16 18 46" src="https://github.com/user-attachments/assets/a3c8cf4e-9c43-465e-849b-f24754a4514d" />

This happens to `**bold**` style too.
