docs: typos in README

[amber-moe]

Have you read the Contributing Guidelines on issues?

• I have read the Contributing Guidelines on issues.

Description

Self-service

• I'd be willing to address this documentation request myself.

[hustjieke]

Thanks for pointed out the typos, would you like to make a pr for this problem? @Amber1990Zhang

[Nliver]

Thanks for reminding us, I didn't expect you as a foreign Vtuber to read our Readme so carefully, I am very moved, we will update this punctuation mark soon, you did a great job! Look forward to your continued attention!