ci: add codespell document check

[skywxFang]

Description

Add a pre-commit based codespell workflow for documentation files and fix existing spelling issues in docs.

Testing

Here are the workflow examples:

Workflow fails when a new typo is introduced
Workflow passes after the typo is fixed

---

Checklist

Before submitting a Pull Request, please ensure the following:

• 🚨 This PR does not introduce breaking changes.
• All CI checks (GH Actions) pass.
• Documentation is updated as needed.
• Tests are updated or added as necessary.
• Code is well-commented, especially in complex areas.
• Git history is clean — commits are squashed to the minimum necessary.

[skywxFang]

Hi @Shen7436, PTAL. Here are the workflow examples:

• Workflow fails when a new typo is introduced
• Workflow passes after the typo is fixed

[Shen7436]

Hi @Shen7436, PTAL. Here are the workflow examples:

• Workflow fails when a new typo is introduced
• Workflow passes after the typo is fixed

Hi @skywxFang The update LGTM! Thanks for you effort. I have no further comments :)

[skywxFang]

Hi @leeebo PTAL, thanks!

[leeebo]

@skywxFang LGTM, Thanks!