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Update Custom Diffusion Documentation for Multiple Concept Inference to resolve issue #10791 (#10792)

Update Custom Diffusion Documentation for Multiple Concept Inference

This PR updates the Custom Diffusion documentation to correctly demonstrate multiple concept inference by:

- Initializing the pipeline from a proper foundation model (e.g., "CompVis/stable-diffusion-v1-4") instead of a fine-tuned model.
- Defining model_id explicitly to avoid NameError.
- Correcting method calls for loading attention processors and textual inversion embeddings.