Fix differential equation tutorial not converging #592
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Closes #588 by reducing the amount of random noise in the synthetic data, and also making the priors in the model more strongly peaked on the ground truth. (I suppose that this is a bit of a cheat and ideally we'd sample more, but the docs already take a long time to run.)
Before: https://turinglang.org/docs/tutorials/bayesian-differential-equations/
After: https://turinglang.org/docs/pr-previews/592/tutorials/bayesian-differential-equations/