Correct spelling errors in README.md for inference examples

[mao3267]

Description

I am new to the PiPPy community and this is my first pr, so feel free to correct me if I am wrong.
I have corrected spelling errors and markdown format in the README.md file for inference examples.
For instance, the threshold option for split_policy. I hope that I understand it right.

Type of change

Documentation

Feature/Issue validation/testing

None

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[kwen2501]

Thanks for the changes! And welcome to the PiPPy community!
The changes LGTM!

Ps: I want to note that the example in the inference folder needs update to work with PiPPy's new APIs. For newer examples, please refer to: examples/hf (there are ~30 HuggingFace examples here). For running ultra large models that cannot initialize on a single GPU, please refer to: examples/cpu_init

[kwen2501]

Cc: @HamidShojanazeri