docs: outputs: flowcounter: general doc updates and cleanup

[eschabell]

• Lowercase Key column entries
• Add missing event_based parameter
• Sort config param table alphabetically
• Remove redundant intro sentence
• Add missing period to unit description

Applies to #2412

Summary by CodeRabbit

• Documentation
  • Updated flowcounter configuration parameters: standardized Unit and Workers to lowercase (unit, workers) and introduced a new event_based parameter to enable time bucketing using event timestamps.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 84eee254-4083-4b94-959a-fc1ef3bf4687

📥 Commits

Reviewing files that changed from the base of the PR and between 9691fb1 and f88467b.

📒 Files selected for processing (1)

• pipeline/outputs/flowcounter.md

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📝 Walkthrough

Walkthrough

This PR updates the flowcounter output plugin documentation by renaming configuration parameters from CamelCase (Unit, Workers) to lowercase variants (unit, workers) and introduces a new event_based parameter enabling time bucketing based on event timestamps.

Changes

Cohort / File(s)	Summary
Flowcounter Output Plugin Configuration pipeline/outputs/flowcounter.md	Renamed configuration keys to lowercase (Unit → unit, Workers → workers), added new event_based parameter for event timestamp-based time bucketing, and updated parameter descriptions.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• docs: outputs: cloudwatch: add workers, fix classic key casing, fix bool values #2420: Updates workers parameter configuration for output plugins with similar key casing changes.
• docs: outputs: elasticsearch: updating doc to latest code #2428: Performs identical CamelCase to snake_case configuration key renaming across output plugin documentation.
• docs: in_process: updates to config parameters #2330: Applies the same configuration parameter key normalization pattern to different plugins (in_process).

Suggested reviewers

• cosmo0920
• patrick-stephens

Poem

🐰 Lowercase letters hop with grace,
Configuration finds its rightful place,
Workers and units, now so neat,
Event timestamps make the flow complete!

🚥 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 'docs: outputs: flowcounter: general doc updates and cleanup' accurately describes the main changes—documentation updates to the flowcounter output configuration, including parameter updates and formatting improvements.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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• Create PR with unit tests

📝 Coding Plan

• Generate coding plan for human review comments

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[eschabell]

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[coderabbitai]

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[eschabell]

@cosmo0920 and @patrick-stephens ready for review!