[CI] Ensure documentation build is checked in CI (#2842)

docs/source/conf.py

@@ -94,3 +94,5 @@ class MockedClassDocumenter(autodoc.ClassDocumenter):
 
 
 autodoc.ClassDocumenter = MockedClassDocumenter
+
+navigation_with_keys = False

docs/source/index.rst

@@ -89,6 +89,7 @@ Documentation
    :caption: Quantization
 
    quantization/auto_awq
+   quantization/fp8_e5m2_kv_cache
 
 .. toctree::
    :maxdepth: 2

docs/source/quantization/fp8_e5m2_kv_cache.rst

@@ -9,6 +9,7 @@ The FP8 data format retains 2~3 mantissa bits and can convert float/fp16/bflaot1
 Here is an example of how to enable this feature:
 
 .. code-block:: python
+
     from vllm import LLM, SamplingParams
     # Sample prompts.
     prompts = [