DOC: Typo In Audio Classification Documentation

[Uvi-12]

The term "finetune" is used throughout the documentation, but the correct form should be "fine-tune".

[Rocketknight1]

I think both are acceptable! Words that are constantly used in the same hyphenated pairing in English often get merged into a single word over time (e.g. "e-mail" was the only correct form 20 years ago but now "email" is completely fine). See the relevant Wikipedia section for more.