Update geometry.md

[stuart-fb]

Correct axis for camera flip rotation.

Pull Request Template

Summary I think the docs mis-identify which axis is rotated around to convert between standard and flipped camera.

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[facebook-github-bot]

@enpe has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[enpe]

Good find! Thanks for reporting it!

[facebook-github-bot]

@enpe merged this pull request in facebookresearch/ocean@56e00bb7488af574d196da64fd0b619ced15d868.