[Docs] Fix hallucinated stage CLI flags in documentation and comments (#4512)

Signed-off-by: akshatvishu <akshatnayak197@gmail.com>

docs/user_guide/examples/online_serving/glm_image.md

@@ -19,7 +19,7 @@ both stages on a single GPU, override per stage:
 
 ```bash
 vllm serve zai-org/GLM-Image --omni --port 8091 \
-    --stage-0-devices 0 --stage-1-devices 0
+    --stage-overrides '{"0": {"devices": "0"}, "1": {"devices": "0"}}'
 ```
 
 ## API Calls

vllm_omni/deploy/mimo_audio.yaml

@@ -4,8 +4,8 @@
 # Default mode is async-chunk streaming on a single GPU (both stages on
 # device 0) through SharedMemoryConnector. For the legacy 2-GPU sync
 # pipeline (stage 1 on a second card), pass ``--no-async-chunk
-# --stage-1-devices 1 --stage-1-max-model-len 18192
-# --stage-1-max-num-batched-tokens 18192`` to the serve CLI.
+# --stage-overrides '{"1": {"devices": "1", "max_model_len": 18192, "max_num_batched_tokens": 18192}}'``
+# to the serve CLI.
 async_chunk: true
 dtype: bfloat16
 

vllm_omni/model_executor/stage_configs/mimo_audio.yaml

@@ -4,8 +4,8 @@
 # Default mode is async-chunk streaming on a single GPU (both stages on
 # device 0) through SharedMemoryConnector. For the legacy 2-GPU sync
 # pipeline (stage 1 on a second card), pass ``--no-async-chunk
-# --stage-1-devices 1 --stage-1-max-model-len 18192
-# --stage-1-max-num-batched-tokens 18192`` to the serve CLI.
+# --stage-overrides '{"1": {"devices": "1", "max_model_len": 18192, "max_num_batched_tokens": 18192}}'``
+# to the serve CLI.
 async_chunk: true
 dtype: bfloat16