Fix typos in CONTRIBUTING.md

[fishmandev]

Typo fix

All Submissions

• [x] Have you followed the guidelines in our Contributing document?
• [x] Have you checked to ensure there aren't other open Pull Requests for the same update/change?

New Feature Submissions

1. [ ] Does your submission pass tests?
2. [ ] Have you lint your code locally prior to submission?

Changes to Core Features

• [ ] Have you added an explanation of what your changes do and why you'd like us to include them?
• [ ] Have you written new tests for your core changes, as applicable?
• [ ] Have you successfully ran tests with your changes locally?

[Kshitij978]

@fishmandev Thanks for improving the quality of the project. ✨🚀