Rename q to norm_q in actor_step() and do not output Q-values in PopArt example.
Rename q to norm_q in actor_step() and do not output Q-values in PopArt example.

PiperOrigin-RevId: 351546244
Change-Id: I45a9bf5e0e7dac5cdea2435f8453148c63041f9c

deepmind/rlax,deepmind/rlax