docs(tracing): remove Literal AI — page is not Agents SDK specific

Literal AI's integration page covers the general OpenAI API; the Agents
SDK is only a minor section. Keeping only HoneyHive and Helicone which
have fully dedicated OpenAI Agents SDK integration pages.

Author: m1lestones

docs/tracing.md

@@ -220,6 +220,5 @@ The following community and vendor integrations support the OpenAI Agents SDK tr
 -   [PostHog](https://posthog.com/docs/llm-analytics/installation/openai-agents)
 -   [Traccia](https://traccia.ai/docs/integrations/openai-agents)
 -   [PromptLayer](https://docs.promptlayer.com/languages/integrations#openai-agents-sdk)
--   [Literal AI](https://docs.literalai.com/integrations/openai)
 -   [HoneyHive](https://docs.honeyhive.ai/v2/integrations/openai-agents)
 -   [Helicone](https://docs.helicone.ai/gateway/integrations/openai-agents)