fix: update gb200 instructions and add a temp container tag (#3741)

docs/backends/sglang/dsr1-wideep-gb200.md

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 # Running DeepSeek-R1 Disaggregated with WideEP on GB200s
@@ -26,11 +14,15 @@ Dynamo supports SGLang's GB200 implementation of wide expert parallelism and lar
 > [!Note]
 > Please ensure that you are building this on an ARM64 machine. The correct SGLang image will be selected automatically via the multi-arch manifest.
 
+> [!Note]
+> Please use `--build-arg SGLANG_IMAGE_TAG=nightly-dev-20251019-fda0cb2a` to build the container due to a bug that we found with the DeepEP version being installed. This was fixed in [PR 11773](https://github.com/sgl-project/sglang/pull/11773). When SGLang releases a version > `0.5.3.post3` we will update these instructions.
+
 ```bash
 cd $DYNAMO_ROOT
 docker build \
   -f container/Dockerfile.sglang-wideep \
   -t dynamo-wideep-gb200 \
+  --build-arg SGLANG_IMAGE_TAG=nightly-dev-20251019-fda0cb2a \
   --no-cache \
   .
 ```
@@ -62,7 +54,7 @@ docker run \
 # run ingress
 python3 -m dynamo.frontend --http-port=8000 &
 # run prefill worker
-SGLANG_DEEPEP_NUM_MAX_DISPATCH_TOKENS_PER_RANK=2048 \
+DYN_SKIP_SGLANG_LOG_FORMATTING=1 \
 MC_TE_METRIC=true \
 SGLANG_DISAGGREGATION_HEARTBEAT_MAX_FAILURE=100000 \
 SGLANG_DISAGGREGATION_BOOTSTRAP_TIMEOUT=100000 \
@@ -72,7 +64,7 @@ MC_FORCE_MNNVL=1 \
 NCCL_MNNVL_ENABLE=1 \
 NCCL_CUMEM_ENABLE=1 \
 SGLANG_USE_MESSAGE_QUEUE_BROADCASTER=0 \
-SGL_DISABLE_TP_MEMORY_INBALANCE_CHECK=1 \
+SGLANG_DISABLE_TP_MEMORY_INBALANCE_CHECK=1 \
 PYTHONUNBUFFERED=1 \
 python3 -m dynamo.sglang \
   --served-model-name deepseek-ai/DeepSeek-R1 \
@@ -92,8 +84,9 @@ python3 -m dynamo.sglang \
   --max-running-requests 6144 \
   --context-length 2716 \
   --disable-radix-cache \
-  --enable-deepep-moe \
-  --deepep-mode low_latency \
+  --moe-a2a-backend deepep \
+  --load-balance-method round_robin \
+  --deepep-mode normal \
   --moe-dense-tp-size 1 \
   --enable-dp-lm-head \
   --disable-shared-experts-fusion \
@@ -109,6 +102,8 @@ python3 -m dynamo.sglang \
   --log-level debug
 ```
 
+On the other prefill nodes (this example has 2 total prefill nodes), run the same command but change `--node-rank` to 1
+
 4. Run the decode worker on the head decode node
 
 ```bash
@@ -143,11 +138,12 @@ python3 -m dynamo.sglang \
   --max-running-requests 36864 \
   --context-length 2716 \
   --disable-radix-cache \
-  --enable-deepep-moe \
+  --moe-a2a-backend deepep \
+  --prefill-round-robin-balance \
   --deepep-mode low_latency \
   --moe-dense-tp-size 1 \
   --enable-dp-lm-head \
-  --cuda-graph-bs 768 \
+  --cuda-graph-max-bs 256 \
   --disable-shared-experts-fusion \
   --ep-num-redundant-experts 32 \
   --ep-dispatch-algorithm static \
@@ -159,4 +155,4 @@ python3 -m dynamo.sglang \
   --log-level debug
 ```
 
-On the other decode nodes (this example has 12 total decode nodes), run the same command but change `--node-rank` to 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11
\ No newline at end of file
+On the other decode nodes (this example has 2 total decode nodes), run the same command but change `--node-rank` to 1
\ No newline at end of file