Flowmark on malformed links worsens the situation

For example, running on this with the extra paren

```
- As a side note, there is also an argument that it’s
a legal requirement of ISOs to have a 90-day
exercise window.
This is technically [true but misleading]((https://news.ycombinator.com/item?id=9254299), as it’s possible still to give employees the
ability lawfully by changing the nature of the options (as illustrated by
[many companies](https://github.com/holman/extended-exercise-windows) now choosing to do).
```

yields

```
- As a side note, there is also an argument that it’s a legal requirement of ISOs to have a
90-day exercise window.
This is technically [true but misleading]\((),
as it’s possible still to give employees the ability lawfully by changing the nature of
the options (as illustrated by
[many companies](https://github.com/holman/extended-exercise-windows) now choosing to do).
```