Fix a typo in the resilience metric Engineering Reference

[xuanluo113]

Pull request overview

• Fixes Typos in Heat Index calculation #8753

Pull Request Author

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[mitchute]

I've confirmed the changes in the docs now reflect what is in the code. I've also merge develop into this branch locally and confirmed that the Eng Ref builds. This is good to go, and there's no need to spend more CI cycles on this. Merging.