fix: prometheus metrics example documentation

[d3xvn]

• Update docstring to clarify MetricsCollector is automatically created by Agent
• Fix setup steps to be more accurate
• Update stale comment about MetricsCollector attachment

Summary by CodeRabbit

• Documentation
  • Updated Prometheus metrics example to clarify that MetricsCollector is automatically attached to agents when OpenTelemetry is configured.
  • Revised Prometheus exporter setup instructions for improved clarity.

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[coderabbitai]

📝 Walkthrough

Walkthrough

Updates the Prometheus metrics example to reflect that MetricsCollector is now automatically attached to agents when OpenTelemetry is configured, eliminating the need for manual attachment. Adjusts setup instructions and related documentation accordingly.

Changes

Cohort / File(s)	Summary
Example documentation updates examples/06_prometheus_metrics_example/prometheus_metrics_example.py	Updated descriptive text to clarify automatic MetricsCollector attachment; swapped Prometheus exporter initialization step with HTTP server startup; modified join\_call comments to reflect automatic rather than manual attachment behavior

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• feat: add Grafana dashboard to prometheus metrics example #295: Modifies the same prometheus_metrics_example file to remove opt-in MetricsCollector pattern and adjust Prometheus startup initialization

Suggested labels

examples, docs

Poem

The metrics arrive unbidden now,
shadows pooling at each Agent's feet—
no summoning required, no ritual.
What was once manual, intentional,
bleeds automatic through the veins.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the main change: updating documentation in the prometheus_metrics_example.py file to clarify MetricsCollector behavior and fix setup instructions.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing touches

• 📝 Generate docstrings

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