Update OpenTelemetry endpoints for DataDog providers

[justin-chizer]

Summary

Looks like DataDog has updated their docs for OTEL ingestion and Logs.
Please let me know if I need to make any other edits.

Screenshots (optional)

Documentation checklist

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• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
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[cloudflare-docs-bot]

Review

✅ No issues found in commit 37b8598.

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