docs: update package doc to reflect OTEL as primary tracing backend

[ankurs]

Summary

Update package doc comment to reflect that tracing is now via OpenTelemetry OTLP (supporting Jaeger, Grafana Tempo, Honeycomb, etc.) rather than listing Jaeger/Zipkin as direct backends.

Part of Jaeger client removal (go-coldbrew/core#50).

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Reviewing files that changed from the base of the PR and between 3bf34ce and 23e8a4a.

📒 Files selected for processing (1)

• doc.go

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• Create PR with unit tests
• Commit unit tests in branch chore/update-doc-remove-jaeger

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[Copilot]

Pull request overview

Updates the package-level documentation for tracing to describe OpenTelemetry/OTLP as the primary trace export path, aligning docs with the planned Jaeger client removal effort.

Changes:

• Update doc.go package comment to reference OpenTelemetry + OTLP-compatible backends instead of direct Jaeger/Zipkin backends.

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