[Benchmark] Update bench doc with mtbench, blazedit, spec bench (#24450)

Signed-off-by: Ekagra Ranjan <3116519+ekagra-ranjan@users.noreply.github.com>

benchmarks/README.md

@@ -95,6 +95,24 @@ become available.
       <td style="text-align: center;">✅</td>
       <td><code>lmms-lab/LLaVA-OneVision-Data</code>, <code>Aeala/ShareGPT_Vicuna_unfiltered</code></td>
     </tr>
+    <tr>
+      <td><strong>HuggingFace-MTBench</strong></td>
+      <td style="text-align: center;">✅</td>
+      <td style="text-align: center;">✅</td>
+      <td><code>philschmid/mt-bench</code></td>
+    </tr>
+    <tr>
+      <td><strong>HuggingFace-Blazedit</strong></td>
+      <td style="text-align: center;">✅</td>
+      <td style="text-align: center;">✅</td>
+      <td><code>vdaita/edit_5k_char</code>, <code>vdaita/edit_10k_char</code></td>
+    </tr>
+    <tr>
+      <td><strong>Spec Bench</strong></td>
+      <td style="text-align: center;">✅</td>
+      <td style="text-align: center;">✅</td>
+      <td><code>wget https://raw.githubusercontent.com/hemingkx/Spec-Bench/refs/heads/main/data/spec_bench/question.jsonl</code></td>
+    </tr>
     <tr>
       <td><strong>Custom</strong></td>
       <td style="text-align: center;">✅</td>
@@ -239,6 +257,43 @@ vllm bench serve \
     --num-prompts 2048
 ```
 
+### Spec Bench Benchmark with Speculative Decoding
+
+``` bash
+VLLM_USE_V1=1 vllm serve meta-llama/Meta-Llama-3-8B-Instruct \
+    --speculative-config $'{"method": "ngram",
+    "num_speculative_tokens": 5, "prompt_lookup_max": 5,
+    "prompt_lookup_min": 2}'
+```
+
+[SpecBench dataset](https://github.com/hemingkx/Spec-Bench)
+
+Run all categories:
+
+``` bash
+# Download the dataset using:
+# wget https://raw.githubusercontent.com/hemingkx/Spec-Bench/refs/heads/main/data/spec_bench/question.jsonl
+
+vllm bench serve \
+    --model meta-llama/Meta-Llama-3-8B-Instruct \
+    --dataset-name spec_bench \ 
+    --dataset-path "<YOUR_DOWNLOADED_PATH>/data/spec_bench/question.jsonl" \
+    --num-prompts -1
+```
+
+Available categories include `[writing, roleplay, reasoning, math, coding, extraction, stem, humanities, translation, summarization, qa, math_reasoning, rag]`.
+
+Run only a specific category like "summarization":
+
+``` bash
+vllm bench serve \
+    --model meta-llama/Meta-Llama-3-8B-Instruct \
+    --dataset-name spec_bench \ 
+    --dataset-path "<YOUR_DOWNLOADED_PATH>/data/spec_bench/question.jsonl" \
+    --num-prompts -1
+    --spec-bench-category "summarization"
+```
+
 ### Other HuggingFaceDataset Examples
 
 ```bash
@@ -295,6 +350,18 @@ vllm bench serve \
     --num-prompts 80
 ```
 
+`vdaita/edit_5k_char` or `vdaita/edit_10k_char`:
+
+``` bash
+vllm bench serve \
+    --model Qwen/QwQ-32B \
+    --dataset-name hf \
+    --dataset-path vdaita/edit_5k_char \
+    --num-prompts 90 \
+    --blazedit-min-distance 0.01 \
+    --blazedit-max-distance 0.99
+```
+
 ### Running With Sampling Parameters
 
 When using OpenAI-compatible backends such as `vllm`, optional sampling