Currently code block is unindented based on the leading spaces of starting separator.

```d
/**
    ----    <--- leading 4 spaces
    void foo() {}    <--- leading 4 spaces
        code;        <--- leading 4 + 4 spaces
    ----
*/
```

Generates following ddoc:
```
void foo() {}  <--- 4 - 4= leading 0 spaces
    code;      <--- 4 - 4 + 4 = leading 4 spaces
```

Here is using this mechanism.