chore(docs): Added comet opik to tracing AND formatted into a list (#73)

Comet Opik added support for Agent SDK tracing and should be included.

Author: rm-openai

docs/tracing.md

@@ -101,3 +101,4 @@ To customize this default setup, to send traces to alternative or additional bac
 -   [Keywords AI](https://docs.keywordsai.co/integration/development-frameworks/openai-agent)
 -   [LangSmith](https://docs.smith.langchain.com/observability/how_to_guides/trace_with_openai_agents_sdk)
 -   [Maxim AI](https://www.getmaxim.ai/docs/observe/integrations/openai-agents-sdk)
+-   [Comet Opik](https://www.comet.com/docs/opik/tracing/integrations/openai_agents)