docs: `MLflow API` and examples (#9547)

Added docs and links to the API and examples provided by MLflow itself

docs/extras/integrations/providers/mlflow_ai_gateway.mdx

@@ -1,6 +1,9 @@
 # MLflow AI Gateway
 
->`The MLflow AI Gateway` service is a powerful tool designed to streamline the usage and management of various large language model (LLM) providers, such as OpenAI and Anthropic, within an organization. It offers a high-level interface that simplifies the interaction with these services by providing a unified endpoint to handle specific LLM related requests. See [the MLflow AI Gateway documentation](https://mlflow.org/docs/latest/gateway/index.html) for more details.
+>[The MLflow AI Gateway](https://www.mlflow.org/docs/latest/gateway/index.html) service is a powerful tool designed to streamline the usage and management of various large 
+> language model (LLM) providers, such as OpenAI and Anthropic, within an organization. It offers a high-level interface 
+> that simplifies the interaction with these services by providing a unified endpoint to handle specific LLM related requests.
+> See [the MLflow AI Gateway documentation](https://mlflow.org/docs/latest/gateway/index.html) for more details.
 
 ## Installation and Setup
 
@@ -43,6 +46,16 @@ Start the Gateway server:
 mlflow gateway start --config-path /path/to/config.yaml
 ```
 
+## Example provided by `MLflow`
+
+>The `mlflow.langchain` module provides an API for logging and loading `LangChain` models. 
+> This module exports multivariate LangChain models in the langchain flavor and univariate LangChain 
+> models in the pyfunc flavor.
+ 
+See the [API documentation and examples](https://www.mlflow.org/docs/latest/python_api/mlflow.langchain.html).
+
+
+
 ## Completions Example
 
 ```python