Updates Needed in Datasets

The grad_updates_per_step hyperparameter for SAC changed at some point in the last year or two from being a decimal value to being an integer. I believe the old values are just the inversions of the new (e.g. 8 is 0.125). Is that correct? Either way the brax/datasets readme and data are out of sync with the rest of the repo since they follow the old decimal convention.