Add example

Signed-off-by: DarkLight1337 <[email protected]>

docs/source/serving/openai_compatible_server.md

@@ -146,13 +146,20 @@ completion = client.chat.completions.create(
   ]
 )
 ```
-Most chat templates for LLMs expect the `content` field to be a string but there are some newer models like 
+
+Most chat templates for LLMs expect the `content` field to be a string, but there are some newer models like 
 `meta-llama/Llama-Guard-3-1B` that expect the content to be formatted according to the OpenAI schema in the
 request. vLLM provides best-effort support to detect this automatically, which is logged as a string like
 *"Detected the chat template content format to be..."*, and internally converts incoming requests to match
-the detected format. If the result is not what you expect, you can use the `--chat-template-content-format`
-CLI argument to override which format to use (`"string"` or `"openai"`).
+the detected format, which can be one of:
+
+- `"string"`: A string.
+  - Example: `"Hello world"`
+- `"openai"`: A list of dictionaries, similar to OpenAI schema.
+  - Example: `[{"type": "text", "text": "Hello world!"}]`
 
+If the result is not what you expect, you can set the `--chat-template-content-format` CLI argument
+to override which format to use.
 
 ## Command line arguments for the server