[Doc] Sync and fix. (#2110)

Signed-off-by: Alicia <115451386+congw729@users.noreply.github.com>

docs/user_guide/examples/offline_inference/mammothmodal2_preview.md

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+# MammothModa2-Preview
+
+Source <https://github.com/vllm-project/vllm-omni/tree/main/examples/offline_inference/mammothmodal2_preview>.
+
+
+## Run examples (MammothModa2-Preview)
+
+Download model
+```bash
+hf bytedance-research/MammothModa2-Preview --local-dir ./MammothModa2-Preview
+```
+
+### Text-to-Image (T2I)
+
+```bash
+python examples/offline_inference/mammothmodal2_preview/run_mammothmoda2_t2i.py \
+  --model ./MammothModa2-Preview \
+  --stage-config ./vllm_omni/model_executor/stage_configs/mammoth_moda2.yaml \
+  --prompt "A stylish woman riding a motorcycle in NYC, movie poster style" \
+  --height 1024 \
+  --width 1024 \
+  --num-inference-steps 50 \
+  --text-guidance-scale 4.0 \
+  --out output.png
+```
+
+### Image Summary
+
+```bash
+python examples/offline_inference/mammothmodal2_preview/run_mammothmoda2_image_summarize.py \
+  --model ./MammothModa2-Preview \
+  --stage-config ./vllm_omni/model_executor/stage_configs/mammoth_moda2_ar.yaml \
+  --question "Summarize this image." \
+  --image ./image.png
+```
+
+## Example materials
+
+??? abstract "run_mammothmoda2_image_summarize.py"
+    ``````py
+    --8<-- "examples/offline_inference/mammothmodal2_preview/run_mammothmoda2_image_summarize.py"
+    ``````
+??? abstract "run_mammothmoda2_t2i.py"
+    ``````py
+    --8<-- "examples/offline_inference/mammothmodal2_preview/run_mammothmoda2_t2i.py"
+    ``````