How Transformers solve tasks - ASR section refers to task using Whisper but task actually uses Wav2Vec2

The [Automatic speech recognition](https://huggingface.co/learn/llm-course/chapter1/5?fw=pt#automatic-speech-recognition) segment of Section 1 "Transformer Models" > "How 🤗 Transformers solve tasks" refers to

> Check out our complete [automatic speech recognition guide](https://huggingface.co/docs/transformers/tasks/asr) to learn how to finetune Whisper and use it for inference!

However the guide actually uses Wav2Vec2, not Whisper.

This is a dual request:

1. Update the segment in question to refer to Wav2Vec2
2. Update the task to use Whisper