Missing methods of `AutoencoderKL` in online docs

The [`decode`](https://github.com/huggingface/diffusers/blob/a080f0d3a21104c19effb4d9d95dcb710d99c19b/src/diffusers/models/autoencoders/autoencoder_kl.py#L281) method of `AutoencoderKL` is absent from the [online doc](https://huggingface.co/docs/diffusers/main/en/api/models/autoencoderkl#autoencoderkl); same for `encode`.

Maybe docgen is affected by `apply_forward_hook`?

Start with src/diffusers/models/autoencoders/autoencoder_kl.py, especially the decode and encode methods linked in the issue, and inspect how docgen handles apply_forward_hook. Check the AutoencoderKL online documentation to confirm the missing entries; done means both methods are generated and visible there.

Scritto dal modello di indicizzazione a partire dal testo della issue.