Minor spelling and grammar fixes

[dbm79]

• [X ] I have read freeCodeCamp's contribution guidelines.
• [X ] My pull request has a descriptive title (not a vague title like Update index.md)
• [X ] My pull request targets the master branch of freeCodeCamp.
• [X ] None of my changes are plagiarized from another source without proper attribution.
• [X ] My article does not contain shortened URLs or affiliate links.

If your pull request closes a GitHub issue, replace the XXXXX below with the issue number.

Closes #XXXXX

[Manish-Giri]

Hi @devinbmiller

Thank you for your contribution to the page! 👍

We're happy to accept these changes and look forward to future contributions. 🎉