[aDAG] Add documentation for actor.method.bind(args), especially when args is a list

[ruisearch42]

Description

When creating an aDAG, suppose we have activations which is a list of DAGNode, if we'd like to bind them in an actor method reduce_activations, we should use:

actor.reduce_activations.bind(*activations)

instead of

actor.reduce_activations.bind(activations)

Otherwise an exception is thrown:

ValueError: Compiled DAGs require each task to take a ray.dag.InputNode or at least one other DAGNode as an input

This should be explicitly mentioned in the docs when we have beta release.

Link

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