refine fused_moe tuning docs (#5294)

benchmark/kernels/fused_moe_triton/README.md

@@ -8,6 +8,11 @@ This directory contains benchmarking tools for MoE (Mixture of Experts) kernels.
 
 Example usage:
 ```bash
+# Tune Mixtral-8x7B with default settings
+python benchmark/kernels/fused_moe_triton/tuning_fused_moe_triton.py \
+    --model mistralai/Mixtral-8x7B-Instruct-v0.1 \
+    --tune
+
 # Tune Qwen2-57B with FP8 and TP=4
 python benchmark/kernels/fused_moe_triton/tuning_fused_moe_triton.py \
     --model Qwen/Qwen2-57B-A14B-Instruct \
@@ -15,9 +20,12 @@ python benchmark/kernels/fused_moe_triton/tuning_fused_moe_triton.py \
     --dtype fp8_w8a8 \
     --tune
 
-# Tune Mixtral-8x7B with default settings
+# Tune DeepSeek-V3 with FP8, TP=8 and n_share_experts_fusion=8
 python benchmark/kernels/fused_moe_triton/tuning_fused_moe_triton.py \
-    --model mistralai/Mixtral-8x7B-Instruct-v0.1 \
+    --model deepseek-ai/DeepSeek-V3-0324 \
+    --tp-size 8 \
+    --n-share-experts-fusion 8 \
+    --dtype fp8_w8a8 \
     --tune
 ```
 

python/sglang/srt/layers/moe/fused_moe_triton/fused_moe.py

@@ -956,7 +956,7 @@ def get_moe_configs(
     logger.warning(
         (
             "Using default MoE config. Performance might be sub-optimal! "
-            "Config file not found at %s"
+            "Config file not found at %s, you can tune the config with https://github.com/sgl-project/sglang/blob/main/benchmark/kernels/fused_moe_triton/tuning_fused_moe_triton.py."
         ),
         config_file_path,
     )