docs: auto generated documentation for providers (#2543)

# What does this PR do?

Simple approach to get some provider pages in the docs.

Add or update description fields in the provider configuration class
using Pydantic’s Field, ensuring these descriptions are clear and
complete, as they will be used to auto-generate provider documentation
via ./scripts/distro_codegen.py instead of editing the docs manually.

Signed-off-by: Sébastien Han <seb@redhat.com>

docs/source/providers/inference/remote_vllm.md

@@ -0,0 +1,25 @@
+# remote::vllm
+
+## Description
+
+Remote vLLM inference provider for connecting to vLLM servers.
+
+## Configuration
+
+| Field | Type | Required | Default | Description |
+|-------|------|----------|---------|-------------|
+| `url` | `str \| None` | No |  | The URL for the vLLM model serving endpoint |
+| `max_tokens` | `<class 'int'>` | No | 4096 | Maximum number of tokens to generate. |
+| `api_token` | `str \| None` | No | fake | The API token |
+| `tls_verify` | `bool \| str` | No | True | Whether to verify TLS certificates. Can be a boolean or a path to a CA certificate file. |
+
+## Sample Configuration
+
+```yaml
+url: ${env.VLLM_URL}
+max_tokens: ${env.VLLM_MAX_TOKENS:=4096}
+api_token: ${env.VLLM_API_TOKEN:=fake}
+tls_verify: ${env.VLLM_TLS_VERIFY:=true}
+
+```
+