Fix typo in the docs

[astariul]

Description

Fix a small typo in the docs

Checklist

• [x] I have reviewed my own code
• [ ] I have added tests

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 5b6b4b4):

https://yew-rs--pr3631-patch-1-bcbcpqiy.web.app

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