Added GPUStack (#4649)

### What problem does this PR solve?



### Type of change


- [x] Documentation Update

docs/references/agent_component_reference/concentrator.mdx

 
 ## Examples
 
-Explore our general-purpose chatbot agent template, featuring a **Concentrator** component (component ID: **medical**) that relays an execution flow from category 2 of the **Categorize** component to the two translator components:
+Explore our general-purpose chatbot agent template, featuring a **Concentrator** component (component ID: **medical**) that relays an execution flow from category 2 of the **Categorize** component to two translator components:
 
 1. Click the **Agent** tab at the top center of the page to access the **Agent** page.
 2. Click **+ Create agent** on the top right of the page to open the **agent template** page.

docs/references/supported_models.mdx

 | Fish Audio            |                    |                    |                    |                    |                    | :heavy_check_mark: |
 | Gemini                | :heavy_check_mark: | :heavy_check_mark: |                    | :heavy_check_mark: |                    |                    |
 | Google Cloud          | :heavy_check_mark: |                    |                    |                    |                    |                    |
+| GPUStack              | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: |                    | :heavy_check_mark: | :heavy_check_mark: |
 | Groq                  | :heavy_check_mark: |                    |                    |                    |                    |                    |
 | HuggingFace           | :heavy_check_mark: | :heavy_check_mark: |                    |                    |                    |                    |
 | Jina                  |                    | :heavy_check_mark: | :heavy_check_mark: |                    |                    |                    |

rag/llm/__init__.py

 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 #
+#  AFTER UPDATING THIS FILE, PLEASE ENSURE THAT docs/references/supported_models.mdx IS ALSO UPDATED for consistency!
+#
 from .embedding_model import (
     OllamaEmbed,
     LocalAIEmbed,