[doc] fix feature support (vllm-project#70)

Check and update the feature support table.

- both multi-step and speculative decoding require adaptation of corresponding workers
- prompt adapter (finetune method) require adaption in worker.py and model_runner.py

Signed-off-by: MengqingCao <cmq0113@163.com>

Author: MengqingCao

docs/source/features/suppoted_features.md

@@ -3,17 +3,19 @@
 | Feature | Supported | Note |
 |---------|-----------|------|
 | Chunked Prefill | ✗ | Plan in 2025 Q1 |
-| Automatic Prefix Caching | ✅ | Improve performance in 2025 Q1 |
+| Automatic Prefix Caching | ✅ | Improve performance in 2025 Q2 |
 | LoRA | ✗ | Plan in 2025 Q1 |
-| Prompt adapter | ✅ ||
-| Speculative decoding | ✅ | Improve accuracy in 2025 Q1|
-| Pooling | ✗ | Plan in 2025 Q1 |
-| Enc-dec | ✗ | Plan in 2025 Q1 |
+| Prompt adapter | ✗ | Plan in 2025 Q1 |
+| Speculative decoding | ✗ | Plan in 2025 Q1 |
+| Pooling | ✗ | Plan in 2025 Q2 |
+| Enc-dec | ✗ | Plan in 2025 Q2 |
 | Multi Modality | ✅ (LLaVA/Qwen2-vl/Qwen2-audio/internVL)| Add more model support in 2025 Q1 |
 | LogProbs | ✅ ||
 | Prompt logProbs | ✅ ||
 | Async output | ✅ ||
-| Multi step scheduler | ✅ ||
+| Multi step scheduler | ✗ | Plan in 2025 Q1 |
 | Best of | ✅ ||
 | Beam search | ✅ ||
 | Guided Decoding | ✗ | Plan in 2025 Q1 |
+| Tensor Parallel | ✅ | Only "mp" supported now |
+| Pipeline Parallel | ✅ | Only "mp" supported now |