incorrect rendering of language-specific markdown

[jni]

Raw markdown:

The library can be also controlled using the singleton of [`StateManager`](api_reference.md) class:
```python
from midi_app_controller.state.state_manager import get_state_manager

state = get_state_manager()
# Now the library can be controlled using `state`.
```

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Rendering on hublite:

It's not just an issue with the newline/spacing. Lower down in the same file:

### Installing
```sh
python3 -m pip install -e .
```

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