Fix CIFAR 10/100 image ids (fixes #924) and add links to TFF datasets.
Fix CIFAR 10/100 image ids (fixes #924) and add links to TFF datasets.

PiperOrigin-RevId: 420892844

google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research