Incorrect line breaks on markdown comments

When a markdown comment get's formatted and a line is broken up, comment dashes (`//`) are used instead of the markdown dashes (`///`),
# Input
```java
/// This exceeds the line limit
public class Foo {...}
```
# Expected
```java
/// This exceeds 
/// the line limit
public class Foo {...}
```
# Actual
```java
/// This exceeds 
// the line limit
public class Foo {...}
```