style: fixed some typos in the comments

[automano]

---

name: Pull request
about: typos in comments
title: fixed some typos in the comments
labels:
assignees: @panjf2000

1. Are you opening this pull request for bug-fixs, optimizations or new feature?

fixed some typos only for comments

2. Please describe how these code changes achieve your intention.

fixed some typos only for comments

3. Please link to the relevant issues (if any).

no issues related

4. Which documentation changes (if any) need to be made/updated because of this PR?

no need for docs change

4. Checklist

• I have squashed all insignificant commits.
• I have commented my code for explaining package types, values, functions, and non-obvious lines.
• I have written unit tests and verified that all tests passes (if needed).
• I have documented feature info on the README (only when this PR is adding a new feature).
• (optional) I am willing to help maintain this change if there are issues with it later.

[panjf2000]

Thanks