Fix : Grammatic typo in readme
Author: AaadityaG
Pull request: yes

# What does this PR do?

Audio -> an Audio

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Fixes # (issue)


## Before submitting
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Comments:
@amyeroberts 

@amyeroberts should I close it, Please respond 

@AaadityaG Please have patience. There are many people who have open PRs and issues who are waiting for a response. We try to address them as soon as we can but this is normally on the order of hours or days rather than minutes. 

Yes, you can close this PR. The response from ChatGPT is because it doesn't know that "Audio Spectrogram Transformer" is the name of the model. 


@amyeroberts I am very sorry, I must be patient.