[CI/Build] Add markdown linter (#11857)

Signed-off-by: Rafael Vasquez <rafvasq21@gmail.com>

docs/source/deployment/docker.md

@@ -28,8 +28,8 @@ memory to share data between processes under the hood, particularly for tensor p
 You can build and run vLLM from source via the provided <gh-file:Dockerfile>. To build vLLM:
 
 ```console
-$ # optionally specifies: --build-arg max_jobs=8 --build-arg nvcc_threads=2
-$ DOCKER_BUILDKIT=1 docker build . --target vllm-openai --tag vllm/vllm-openai
+# optionally specifies: --build-arg max_jobs=8 --build-arg nvcc_threads=2
+DOCKER_BUILDKIT=1 docker build . --target vllm-openai --tag vllm/vllm-openai
 ```
 
 ```{note}