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

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

docs/source/getting_started/installation/cpu-apple.md

@@ -18,25 +18,23 @@ Currently the CPU implementation for macOS supports FP32 and FP16 datatypes.
 
 After installation of XCode and the Command Line Tools, which include Apple Clang, execute the following commands to build and install vLLM from the source.
 
-```
-$ git clone https://github.com/vllm-project/vllm.git
-$ cd vllm
-$ pip install -r requirements-cpu.txt
-$ pip install -e . 
+```console
+git clone https://github.com/vllm-project/vllm.git
+cd vllm
+pip install -r requirements-cpu.txt
+pip install -e . 
 ```
 
 ```{note}
 On macOS the `VLLM_TARGET_DEVICE` is automatically set to `cpu`, which currently is the only supported device.
 ```
 
-
-
 ## Troubleshooting
 
-If the build has error like the following snippet where standard C++ headers cannot be found, try to remove and reinstall your 
+If the build has error like the following snippet where standard C++ headers cannot be found, try to remove and reinstall your
 [Command Line Tools for Xcode](https://developer.apple.com/download/all/).
 
-```
+```text
 [...] fatal error: 'map' file not found
           1 | #include <map>
             |          ^~~~~
@@ -48,4 +46,3 @@ If the build has error like the following snippet where standard C++ headers can
             |          ^~~~~~~~~
       1 error generated.
 ```
-