docs: update useForOf to include a relevant example

[DeJayDev]

Summary

Unintuitively, the documents for useForOf do not include an actual forOf. While the actual rule does check for the index accession shown in the documents already, it doesn't respect the typescript-eslint rule.

Test Plan

: )

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[arendjr]

Thanks! Can you add this to the Rust source of the rules? The docs are generated from there.

[DeJayDev]

Thank you for the heads up! I totally missed that. I've included it in both files because I don't know how often the Markdown files are overwritten with the Rust rule comment (that's at least what I'm assuming what happens off your comment).

I also got the chance to reread the CONTRIBUTING guidelines and realized I hadn't used conventional commits and I felt bad. Hopefully this name and the last commit is better :)

[arendjr]

Thanks!