Fix typo several files

[UlookEE]

Please ensure you have read the contribution guide before creating a pull request.

fix typo for several files.

Checklist

• I have read the CONTRIBUTING.md document.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.
• I have manually tested my changes end-to-end.
• Any dependent changes have been merged and published in downstream modules.

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[gemini-code-assist]

Summary of Changes

Hello @UlookEE, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on enhancing the overall quality and readability of the codebase by addressing and correcting several typographical errors found in various Python files. These minor adjustments, primarily within docstrings and comments, ensure that the documentation and inline explanations are accurate and professional.

Highlights

• Typo Corrections: Corrected various grammatical errors and misspellings across several Python files, primarily within docstrings and comments, to improve code readability and accuracy.

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[gemini-code-assist]

Code Review

This pull request fixes several typos and grammatical errors across various files, primarily in docstrings. The changes are correct and improve the clarity of the documentation. I've added a few suggestions to further improve code style by shortening some long lines in docstrings to adhere to PEP 8 recommendations, enhancing readability.

[wuliang229]

@UlookEE could you help add a line of "from future import annotations" to src/google/adk/sessions/state.py? https://github.com/google/adk-python/actions/runs/19044530131/job/54389399460?pr=3365

[UlookEE]

@wuliang229 completed

[adk-bot]

Thank you @UlookEE for your contribution! 🎉

Your changes have been successfully imported and merged via Copybara in commit d2888a3.

Closing this PR as the changes are now in the main branch.