regression: quoting doesn't work unless extra newline added
this used to work IIRC, or at least should work:
```
foo
> bar

baz
```

but instead renders as:
```
foo > bar

baz
```

it works only when adding a newline after `foo`:
```
foo

> bar

baz
```

note that github and other tools don't require that newline as you can see below:


foo
> bar

baz


## note
feel free to close if this is nim's rstgen responsability instead