[doc][mkdocs] fix the duplicate Supported features sections in GPU docs (#19606)

Signed-off-by: reidliu41 <reid201711@gmail.com>
Co-authored-by: reidliu41 <reid201711@gmail.com>

docs/getting_started/installation/gpu/cuda.inc.md

@@ -254,7 +254,10 @@ The latest code can contain bugs and may not be stable. Please use it with cauti
 
 See [deployment-docker-build-image-from-source][deployment-docker-build-image-from-source] for instructions on building the Docker image.
 
-## Supported features
+# --8<-- [end:build-image-from-source]
+# --8<-- [start:supported-features]
 
 See [feature-x-hardware][feature-x-hardware] compatibility matrix for feature support information.
+
+# --8<-- [end:supported-features]
 # --8<-- [end:extra-information]

docs/getting_started/installation/gpu/rocm.inc.md

@@ -217,7 +217,10 @@ docker run -it \
 
 Where the `<path/to/model>` is the location where the model is stored, for example, the weights for llama2 or llama3 models.
 
-## Supported features
+# --8<-- [end:build-image-from-source]
+# --8<-- [start:supported-features]
 
 See [feature-x-hardware][feature-x-hardware] compatibility matrix for feature support information.
+
+# --8<-- [end:supported-features]
 # --8<-- [end:extra-information]

docs/getting_started/installation/gpu/xpu.inc.md

@@ -63,7 +63,8 @@ $ docker run -it \
              vllm-xpu-env
 ```
 
-## Supported features
+# --8<-- [end:build-image-from-source]
+# --8<-- [start:supported-features]
 
 XPU platform supports **tensor parallel** inference/serving and also supports **pipeline parallel** as a beta feature for online serving. We require Ray as the distributed runtime backend. For example, a reference execution like following:
 
@@ -78,4 +79,6 @@ python -m vllm.entrypoints.openai.api_server \
 ```
 
 By default, a ray instance will be launched automatically if no existing one is detected in the system, with `num-gpus` equals to `parallel_config.world_size`. We recommend properly starting a ray cluster before execution, referring to the <gh-file:examples/online_serving/run_cluster.sh> helper script.
+
+# --8<-- [end:supported-features]
 # --8<-- [end:extra-information]