docs: fix updatable spelling in README intro

[haosenwang1018]

Fix README intro spelling: updateable -> updatable. Docs-only change.

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[gemini-code-assist]

Code Review

This pull request addresses a typo in the README. I've added a comment with a suggestion to ensure consistency across the document. Separately, please remember to include the Pre-Review Checklist in future pull request descriptions, as outlined in the repository's contribution guidelines.

_{Note: Security Review has been skipped due to the limited scope of the PR.}

[gemini-code-assist]

This corrects the typo here, but another instance of 'updateable' exists on line 45. To ensure consistency throughout the document, please correct that instance as well.

[nan-yu]

This needs to be fixed as well.

[yjbanov]

@haosenwang1018 Would you mind signing the CLA so we can accept your contributions?

[haosenwang1018]

done

…

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[ditman]

I've re-triggered the CLA check and it's now passing. We can land this.