docs: add FutureAGI to tracing documentation (#592)

Hi Team! 

This PR adds FutureAGI to the tracing documentation as one of the
automatic tracing processors for OpenAI agents SDK.


![image](https://github.com/user-attachments/assets/4de3aadc-5efa-4712-8b02-decdedf8f8ef)

Author: NVJKKartik

docs/tracing.md

@@ -101,6 +101,7 @@ To customize this default setup, to send traces to alternative or additional bac
 
 -   [Weights & Biases](https://weave-docs.wandb.ai/guides/integrations/openai_agents)
 -   [Arize-Phoenix](https://docs.arize.com/phoenix/tracing/integrations-tracing/openai-agents-sdk)
+-   [Future AGI](https://docs.futureagi.com/future-agi/products/observability/auto-instrumentation/openai_agents)
 -   [MLflow (self-hosted/OSS](https://mlflow.org/docs/latest/tracing/integrations/openai-agent)
 -   [MLflow (Databricks hosted](https://docs.databricks.com/aws/en/mlflow/mlflow-tracing#-automatic-tracing)
 -   [Braintrust](https://braintrust.dev/docs/guides/traces/integrations#openai-agents-sdk)