typo: fix typos in CONTRIBUTING.md and deepspeed.mdx (#24184)
* typo: fix typos in CONTRIBUTING.md and deepspeed.mdx
* Update CONTRIBUTING.md
Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>
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Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>