Rename PriorityTable to Table, priority_tables to tables, and distributions to selectors in demo.ipynb.
Rename PriorityTable to Table, priority_tables to tables, and distributions to selectors in demo.ipynb.

PiperOrigin-RevId: 313562196
Change-Id: I9903f2549807d3d18590a270ddf7cecf8b794ef4

deepmind/reverb,deepmind/reverb,deepmind/reverb,deepmind/reverb