[RLlib; docs] RLlib documentation do-over (new API stack): Main index…

… page. (ray-project#48285)

doc/source/_includes/rllib/new_api_stack.rst

@@ -1,7 +1,7 @@
 .. note::
 
     Ray 2.10.0 introduces the alpha stage of RLlib's "new API stack".
-    The Ray Team plans to transition algorithms, example scripts, and documentation to the new code base
-    thereby incrementally replacing the "old API stack" (e.g., ModelV2, Policy, RolloutWorker) throughout the subsequent minor releases leading up to Ray 3.0.
+    The team is currently transitioning algorithms, example scripts, and
+    documentation to the new code base throughout the subsequent minor releases leading up to Ray 3.0.
 
-    :doc:`See here </rllib/rllib-new-api-stack>` for more details on how to use the new API stack.
+    :doc:`See here </rllib/rllib-new-api-stack>` for more details on how to activate and use the new API stack.

doc/source/rllib/doc_code/rllib_in_60s.py

@@ -2,13 +2,13 @@
 
 # __rllib-in-60s-begin__
 from ray.rllib.algorithms.ppo import PPOConfig
+from ray.rllib.core.rl_module.default_model_config import DefaultModelConfig
 
 config = (  # 1. Configure the algorithm,
     PPOConfig()
-    .environment("Taxi-v3")
+    .environment(env="Taxi-v3")
     .env_runners(num_env_runners=2)
-    .framework("torch")
-    .training(model={"fcnet_hiddens": [64, 64]})
+    .rl_module(model_config=DefaultModelConfig(fcnet_hiddens=[64, 64]))
     .evaluation(evaluation_num_env_runners=1)
 )