fixed json syntax error for zero2 configuration file found in deepspeed.md
Author: Yacklin
Pull request: yes

# What does this PR do?
It fixes Json syntax error for example zero2 json configuration file.

(I accidentatlly closed a PR related to it so i have to make another PR)
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Comments:
The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_42406). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

i need someone to approve lol

Merging!

> Merging!

my GOAT!!!