[Docs] Fix API Reference (vllm-project#25140)

Signed-off-by: Harry Mellor <[email protected]>

Author: hmellor

mkdocs.yaml

@@ -79,7 +79,7 @@ plugins:
         - "re:vllm\\._.*"  # Internal modules
         - "vllm.third_party"
         - "vllm.vllm_flash_attn"
-        - !ENV [API_AUTONAV_EXCLUDE, ""]
+        - !ENV [API_AUTONAV_EXCLUDE, "re:^$"]  # Match nothing by default
   - mkdocstrings:
       handlers:
         python: