Update README.md

[mickogoin]

📌 Checklist before creating the PR

• [x] I have created an issue for this PR for traceability
• [x] The title follows the standard format: [doc/gemini/tensor/...]: A concise description
• [x] I have added relevant tags if possible for us to better distinguish different PRs

🚨 Issue number

Link this PR to your issue with words like fixed to automatically close the linked issue upon merge

e.g. fixed #1234, closed #1234, resolved #1234 Resolved #2790

📝 What does this PR do?

Typo corrections for the README.md in relation to the issue #2790

💥 Checklist before requesting a review

• [x] I have linked my PR to an issue (instruction)
• [x] My issue clearly describes the problem/feature/proposal, with diagrams/charts/table/code if possible
• [x] I have performed a self-review of my code
• [x] I have added thorough tests.
• [x] I have added docstrings for all the functions/methods I implemented

⭐️ Do you enjoy contributing to Colossal-AI?

• [x] 🌝 Yes, I do.
• [ ] 🌚 No, I don't.

Tell us more if you don't enjoy contributing to Colossal-AI.