docs: add arize-phoenix to tracing documentation

Author: axiomofjoy

docs/tracing.md

@@ -90,8 +90,9 @@ To customize this default setup, to send traces to alternative or additional bac
 
 External trace processors include:
 
+-   [Arize-Phoenix](https://docs.arize.com/phoenix/tracing/integrations-tracing/openai-agents-sdk)
 -   [Braintrust](https://braintrust.dev/docs/guides/traces/integrations#openai-agents-sdk)
 -   [Pydantic Logfire](https://logfire.pydantic.dev/docs/integrations/llms/openai/#openai-agents)
 -   [AgentOps](https://docs.agentops.ai/v1/integrations/agentssdk)
--   [Scorecard](https://docs.scorecard.io/docs/documentation/features/tracing#openai-agents-sdk-integration))
+-   [Scorecard](https://docs.scorecard.io/docs/documentation/features/tracing#openai-agents-sdk-integration)
 -   [Keywords AI](https://docs.keywordsai.co/integration/development-frameworks/openai-agent)