Add perf numbers for perf_train_cpu
Author: jianan-gu
Pull request: yes

# What does this PR do?

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As mentioned in https://github.com/huggingface/transformers/pull/17138, we are adding some perf numbers in the doc.

cc @sywangyi  @liangan1

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Comments:
@sgugger Could you please review this PR? Thanks!

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Hi @sgugger, 
For the absolute time number to be shown as public in the doc, can we directly mention and link this [public blog](https://huggingface.co/blog/intel-sapphire-rapids) for a reference in this perf_train_cpu doc instead of providing ours? (to simplify this work and avoid extra internal review procedures)

This public blog guides users to run through CPU training and provides realistic results, which is a very practical reference.

Thanks.


Yes, we can definitely link to the blog post instead of the picture.

> Yes, we can definitely link to the blog post instead of the picture.
Hi, @sgugger 
Have refined this PR to add the link to this blog post as a practice example in the doc.
Thanks!

Thanks again for your contribution!