[Doc] Update FAQ links in spec_decode.rst (#9662)

Signed-off-by: whyiug <whyiug@hotmail.com>

docs/source/models/spec_decode.rst

@@ -182,7 +182,7 @@ speculative decoding, breaking down the guarantees into three key areas:
 3. **vLLM Logprob Stability**
    - vLLM does not currently guarantee stable token log probabilities (logprobs). This can result in different outputs for the 
    same request across runs. For more details, see the FAQ section 
-   titled *Can the output of a prompt vary across runs in vLLM?* in the `FAQs <../serving/faq.rst>`_.
+   titled *Can the output of a prompt vary across runs in vLLM?* in the `FAQs <../serving/faq>`_.
 
 
 **Conclusion**
@@ -197,7 +197,7 @@ can occur due to following factors:
 
 **Mitigation Strategies**
 
-For mitigation strategies, please refer to the FAQ entry *Can the output of a prompt vary across runs in vLLM?* in the `FAQs <../serving/faq.rst>`_.
+For mitigation strategies, please refer to the FAQ entry *Can the output of a prompt vary across runs in vLLM?* in the `FAQs <../serving/faq>`_.
 
 Resources for vLLM contributors
 -------------------------------