[doc][core][cgraph] Clean up docs (ray-project#51263)

Signed-off-by: Rui Qiao <[email protected]>

Author: ruisearch42

doc/source/ray-core/compiled-graph/compiled-graph-api.rst

@@ -20,6 +20,7 @@ DAG Construction
 
     ray.actor.ActorMethod.bind
     ray.dag.DAGNode.with_tensor_transport
+    ray.experimental.compiled_dag_ref.CompiledDAGRef
 
 Compiled Graph Operations
 -------------------------

doc/source/ray-core/compiled-graph/quickstart.rst

@@ -232,7 +232,7 @@ GPU to GPU communication
 ------------------------
 Ray Compiled Graphs supports NCCL-based transfers of CUDA ``torch.Tensor`` objects, avoiding any copies through Ray's CPU-based shared-memory object store.
 With user-provided type hints, Ray prepares NCCL communicators and
-operation scheduling ahead of time, avoiding deadlock and `overlapping compute and communication <compiled-graph-overlap>`.
+operation scheduling ahead of time, avoiding deadlock and :ref:`overlapping compute and communication <compiled-graph-overlap>`.
 
 Ray Compiled Graph uses `cupy <https://cupy.dev/>`_ under the hood to support NCCL operations.
 The cupy version affects the NCCL version. The Ray team is also planning to support custom communicators in the future, for example to support collectives across CPUs or to reuse existing collective groups.
@@ -252,6 +252,7 @@ To support GPU-to-GPU communication with NCCL, wrap the DAG node that contains t
     :end-before: __cgraph_nccl_exec_end__
 
 Current limitations include:
+
 * ``torch.Tensor`` and NVIDIA NCCL only
 * Support for peer-to-peer transfers. Collective communication operations are coming soon.
 * Communication operations are currently done synchronously. :ref:`Overlapping compute and communication <compiled-graph-overlap>` is an experimental feature.

doc/source/ray-core/compiled-graph/ray-compiled-graph.rst

@@ -57,7 +57,7 @@ Ray Compiled Graph APIs simplify development of high-performance multi-GPU workl
 
 - Sub-millisecond level task orchestration.
 - Direct GPU-GPU peer-to-peer or collective communication.
-- `Heterogeneous <https://www.youtube.com/watch?v=Mg08QTBILWU>` or MPMD (Multiple Program Multiple Data) execution.
+- `Heterogeneous <https://www.youtube.com/watch?v=Mg08QTBILWU>`_ or MPMD (Multiple Program Multiple Data) execution.
 
 More Resources
 --------------

doc/source/ray-core/compiled-graph/troubleshooting.rst

@@ -52,7 +52,7 @@ Compiled Graph is a new feature and has some limitations:
 
 - Collective operations
 
-  - Compiled Graph only supports the all-reduce collective operation for now.
+  - For GPU to GPU communication, Compiled Graph only supports peer-to-peer transfers. Collective communication operations are coming soon.
 
 Keep an eye out for additional features in future Ray releases:
 - Support better queuing of DAG inputs, to enable more concurrent executions of the same DAG.