Processor plugin docs updates

[eschabell]

Summary of fixes applied:

• Processor: content-modifier.md issues Found: Missing action param, unsorted
• Processor: labels.md issues Found: Unsorted, wrong hash algorithm in example
• Processor: `metrics-selector.md issues Found: Unsorted, typos in context values
• Processor: sampling.md issues Found: Missing debug param, unsorted tables, swapped min/max descriptions

Fixes #2368.

Summary by CodeRabbit

• Documentation
  • Enhanced processor configuration documentation with new parameters and default values.
  • Added action and type conversion options to content modifier configuration.
  • Expanded sampling configuration with debug parameter and default values.
  • Clarified label operation descriptions and updated hash algorithm reference.

[coderabbitai]

📝 Walkthrough

Walkthrough

Documentation updates for four Fluent Bit processor plugins: content-modifier, labels, metrics-selector, and sampling. Changes include adding missing configuration parameters, reordering configuration tables, updating default values, and refining parameter descriptions to align with current functionality.

Changes

Cohort / File(s)	Summary
Processor Documentation Updates pipeline/processors/content-modifier.md, pipeline/processors/labels.md, pipeline/processors/metrics-selector.md, pipeline/processors/sampling.md	Added missing parameters (action, converted_type, debug, label), reordered configuration tables for consistency, updated context values (delete_label → delete_label_value), added Default column to sampling config tables, updated hash algorithm example from SHA-1 to SHA-256, and refined parameter descriptions.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• fluent/fluent-bit-docs#2183: Updates processor documentation with configuration table restructuring and parameter consolidation

Suggested labels

4.2.3

Suggested reviewers

• cosmo0920
• patrick-stephens

Poem

🐰 Docs refined with care and thought,
Parameters sorted as they ought,
New defaults gleaming, clear and bright,
Processor guides now set just right! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main focus of the PR: updating documentation for processor plugins across multiple files.
Linked Issues check	✅ Passed	All coding objectives from issue #2368 are met: missing parameters added (action in content-modifier, debug in sampling), tables alphabetized, and typos/errors fixed across all processor docs.
Out of Scope Changes check	✅ Passed	All changes are scoped to processor plugin documentation updates; no out-of-scope code modifications or unrelated alterations are present.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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