Add more examples to tools/hooks page

[dcharkes]

This PR adds links to better real-world examples in the examples section.

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[dart-github-bot]

Visit the preview URL for this PR (updated for commit cf6f05b):

https://dart-dev--pr6926-tools-hooks-examples-izdb8uw6.web.app

[goderbauer]

LGTM

[parlough]

Thanks for adding these examples!

Looks good to me, but might want to wait for a review from @antfitch in case she has feedback on the descriptions.

[antfitch]

LGTM!