Langtrace Integration: adjust `endpoint` & add `oTel` documentation

[alizenhom]

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Title

Adjust Langtrace endpoint & add oTel documentation

Relevant issues

Type

🆕 New Feature 🐛 Bug Fix 🧹 Refactoring 📖 Documentation 🚄 Infrastructure ✅ Test

Changes

[REQUIRED] Testing - Attach a screenshot of any new tests passing locall

If UI changes, send a screenshot/GIF of working UI fixes

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Name	Status	Preview	Comments	Updated (UTC)
litellm	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 19, 2024 2:29pm

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This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.