Fix: Replace incompatible model loading in example code

## Description

The example code fails at runtime with the following error when attempting to run the fill-mask task:
```python
KeyError: 'logits'
```

## Changes

Replaced:
```python
pipe = pipeline('fill-mask', model=model, tokenizer=tokenizer)
```
with:
```python
pipe = pipeline('fill-mask', model="neuralmind/bert-base-portuguese-cased")
```

## Testing
The code has been successfully tested and runs without error.

## Note
This contribution is part of an ongoing research initiative to systematically identify and correct faulty example code in Hugging Face Model Cards.
We would appreciate a timely review and integration of this patch to support code reliability and enhance reproducibility for downstream users.

README.md

@@ -41,7 +41,7 @@ tokenizer = AutoTokenizer.from_pretrained('neuralmind/bert-base-portuguese-cased
 ```python
 from transformers import pipeline
 
-pipe = pipeline('fill-mask', model=model, tokenizer=tokenizer)
+pipe = pipeline('fill-mask', model="neuralmind/bert-base-portuguese-cased")
 
 pipe('Tinha uma [MASK] no meio do caminho.')
 # [{'score': 0.14287759363651276,