[doc] fix ordered list issue (#20819)

Signed-off-by: reidliu41 <reid201711@gmail.com>

Author: reidliu41

docs/features/spec_decode.md

@@ -256,12 +256,12 @@ speculative decoding, breaking down the guarantees into three key areas:
 2. **Algorithmic Losslessness**
    \- vLLM’s implementation of speculative decoding is algorithmically validated to be lossless. Key validation tests include:
 
-   > - **Rejection Sampler Convergence**: Ensures that samples from vLLM’s rejection sampler align with the target
-   >   distribution. [View Test Code](https://github.com/vllm-project/vllm/blob/47b65a550866c7ffbd076ecb74106714838ce7da/tests/samplers/test_rejection_sampler.py#L252)
-   > - **Greedy Sampling Equality**: Confirms that greedy sampling with speculative decoding matches greedy sampling
-   >   without it. This verifies that vLLM's speculative decoding framework, when integrated with the vLLM forward pass and the vLLM rejection sampler,
-   >   provides a lossless guarantee. Almost all of the tests in <gh-dir:tests/spec_decode/e2e>.
-   >   verify this property using [this assertion implementation](https://github.com/vllm-project/vllm/blob/b67ae00cdbbe1a58ffc8ff170f0c8d79044a684a/tests/spec_decode/e2e/conftest.py#L291)
+    > - **Rejection Sampler Convergence**: Ensures that samples from vLLM’s rejection sampler align with the target
+    >   distribution. [View Test Code](https://github.com/vllm-project/vllm/blob/47b65a550866c7ffbd076ecb74106714838ce7da/tests/samplers/test_rejection_sampler.py#L252)
+    > - **Greedy Sampling Equality**: Confirms that greedy sampling with speculative decoding matches greedy sampling
+    >   without it. This verifies that vLLM's speculative decoding framework, when integrated with the vLLM forward pass and the vLLM rejection sampler,
+    >   provides a lossless guarantee. Almost all of the tests in <gh-dir:tests/spec_decode/e2e>.
+    >   verify this property using [this assertion implementation](https://github.com/vllm-project/vllm/blob/b67ae00cdbbe1a58ffc8ff170f0c8d79044a684a/tests/spec_decode/e2e/conftest.py#L291)
 
 3. **vLLM Logprob Stability**
    \- vLLM does not currently guarantee stable token log probabilities (logprobs). This can result in different outputs for the