Fix doctests for audio models
# What does this PR do?

The condition was wrong (`[]` should be `()`) and failed some doctests as they get wrong classes

```python
if ["SequenceClassification" in model_class or "AudioClassification" in model_class]
```
should be
```python
if ("SequenceClassification" in model_class or "AudioClassification" in model_class)
```
_The documentation is not available anymore as the PR was closed or merged._<|||||>Merge as the failing (TF) test is irrelevant to this PR.