in_tail: add missing config param descriptions

[eschabell]

• watcher_interval: interval to check symbolic link rotation
• progress_check_interval: interval to check for pending data in monitored files (inotify mode)
• progress_check_interval_nsec: nanosecond component of progress check interval

Fixes #11403

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Testing
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• [ N/A ] Example configuration file for the change
• [ N/A ] Debug log output from testing the change
• [ N/A ] Attached Valgrind output that shows no leaks or memory corruption was found

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• [ N/A ] Run local packaging test showing all targets (including any new ones) build.
• [ N/A ] Set ok-package-test label to test for all targets (requires maintainer to do).

Documentation

• [ No] Documentation required for this feature

Note: already documented features.

Backporting

• [ N/A ] Backport to latest stable release.

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Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.

Summary by CodeRabbit

• Documentation
  • Enhanced inline descriptions for configuration options related to file rotation monitoring and data detection intervals, improving clarity for users configuring these settings.

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[coderabbitai]

📝 Walkthrough

Walkthrough

Added inline description strings for three missing configuration parameters in the in_tail plugin: watcher_interval, progress_check_interval, and progress_check_interval_nsec. These descriptions clarify the purpose and behavior of each configuration option with no changes to functional logic.

Changes

Cohort / File(s)	Summary
Configuration parameter documentation plugins/in_tail/tail.c	Added inline description strings for three config entries: watcher_interval (interval to check rotated symbolic link files), progress_check_interval (interval to detect pending data using inotify), and progress_check_interval_nsec (nanosecond component clarification)

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Suggested labels

docs-required

Suggested reviewers

• edsiper
• cosmo0920
• patrick-stephens

Poem

🐰 Three descriptions lost, now found,
For watcher and progress all around,
In tail we hop with glee,
Documentation's wild and free! 📝✨

🚥 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 describes the main change: adding missing descriptions for three in_tail configuration parameters.
Linked Issues check	✅ Passed	The PR adds descriptions for all three configuration parameters (watcher_interval, progress_check_interval, progress_check_interval_nsec) as required by issue #11403.
Out of Scope Changes check	✅ Passed	All changes are directly related to adding missing parameter descriptions in the in_tail plugin configuration map; no unrelated modifications 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 docstrings

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