polish: minor gramma issues for post 2020 next-for-vercel

[vercel[bot]]

@huozhi is attempting to deploy a commit to a Personal Account owned by @rauchg on Vercel.

@rauchg first needs to authorize it.

[vercel[bot]]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployment, click below or on the icon next to each commit.

🔍 Inspect: https://vercel.com/rauchg/blog/4dqh94mhe
✅ Preview: https://blog-git-fork-huozhi-patch-1.rauchg.vercel.app

[rauchg]

Thank you!