[Docs] include the instruction-tuning blog link in the InstructPix2Pix docs (huggingface#3644)

include the instruction-tuning blog link.

Author: sayakpaul

docs/source/en/training/instructpix2pix.mdx

@@ -207,3 +207,5 @@ speed and quality during performance:
 
 Particularly, `image_guidance_scale` and `guidance_scale` can have a profound impact
 on the generated ("edited") image (see [here](https://twitter.com/RisingSayak/status/1628392199196151808?s=20) for an example).
+
+If you're looking for some interesting ways to use the InstructPix2Pix training methodology, we welcome you to check out this blog post: [Instruction-tuning Stable Diffusion with InstructPix2Pix](https://huggingface.co/blog/instruction-tuning-sd). 

examples/instruct_pix2pix/README.md

@@ -185,3 +185,5 @@ speed and quality during performance:
 
 Particularly, `image_guidance_scale` and `guidance_scale` can have a profound impact
 on the generated ("edited") image (see [here](https://twitter.com/RisingSayak/status/1628392199196151808?s=20) for an example).
+
+If you're looking for some interesting ways to use the InstructPix2Pix training methodology, we welcome you to check out this blog post: [Instruction-tuning Stable Diffusion with InstructPix2Pix](https://huggingface.co/blog/instruction-tuning-sd).