docs: fix HF links (#6780)
The current link
https://huggingface.co/docs/transformers/main_classes/deepspeed is very
unhelpful.
It turns out in the past it had some guides:
https://huggingface.co/docs/transformers/v4.27.1/main_classes/deepspeed#shared-configuration
Later it's refreshed and moved to
https://huggingface.co/docs/transformers/deepspeed
getting-started.md