docs: clarify initializer_range parameter description in Idefics3VisionConfig
Author: h3110Fr13nd
Pull request: yes

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Fixes the `make quality` issue due to Idefics3VisionConfig having this line
```python
    initializer_range (`<fill_type>`, *optional*, defaults to 0.02): <fill_docstring>
```
Replaced it with 
```python
    initializer_range (`float`, *optional*, defaults to 0.02):
            The standard deviation of the truncated_normal_initializer for initializing all weight matrices.
```

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