Passing `cross_attention_kwargs` to `StableDiffusionInstructPix2PixPipeline` (#7961)
* Update pipeline_stable_diffusion_instruct_pix2pix.py
Add `cross_attention_kwargs` to `__call__` method of `StableDiffusionInstructPix2PixPipeline`, which are passed to UNet.
* Update documentation for pipeline_stable_diffusion_instruct_pix2pix.py
* Update docstring
* Update docstring
* Fix typing import