docs: in_systemd: fix defaults, grammar, whitespace

[eschabell]

• Change boolean defaults from 'off' to 'false' to match source code: lowercase, read_from_tail, strip_underscores
• Fix grammar in db.sync description: add comma and 'see the' before link
• Remove trailing whitespace after backslash in command-line example

Fixes #2357

Summary by CodeRabbit

• Documentation
  • Updated configuration documentation with corrected default values
  • Standardized default values for configuration settings from "off" to "false"
  • Added SQLite documentation reference for enhanced clarity

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[coderabbitai]

📝 Walkthrough

Walkthrough

Updated systemd input plugin documentation by correcting boolean parameter defaults from off to false for lowercase, read_from_tail, and strip_underscores options, updating db.sync description with SQLite reference, and removing trailing whitespace.

Changes

Cohort / File(s)	Summary
Systemd input documentation updates pipeline/inputs/systemd.md	Changed defaults for 4 boolean configuration options from off to false (lowercase, read_from_tail, strip_underscores); updated db.sync description to reference SQLite docs; removed trailing whitespace from command-line example

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• Updating general layout and case for config options in systemd input plugin docs. Fixes #2214. #2228 — Modifies the same systemd input documentation file with configuration option updates
• in_systemd: review processing updates to config parameter table. #2304 — Updates db.sync configuration description in systemd input documentation

Suggested labels

4.2.1

Suggested reviewers

• cosmo0920
• patrick-stephens

Poem

🐰 Booleans were broken, off as they stood,
Now false, they flow better and good,
Systemd shines bright with defaults so true,
Docs cleaned and corrected—hop, hop, hooray to you! ✨

🚥 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 changes: fixing incorrect boolean defaults, grammar issues, and whitespace problems in the systemd documentation.
Linked Issues check	✅ Passed	All objectives from issue #2357 are met: boolean defaults corrected (off→false), grammar fixed in db.sync description, and whitespace removed from command-line example.
Out of Scope Changes check	✅ Passed	All changes are directly related to the linked issue #2357 requirements: correcting defaults, fixing grammar, and removing whitespace in the systemd input plugin documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@pipeline/inputs/systemd.md`:
- Line 13: The documented defaults for the systemd input options are incorrect:
replace the boolean `false` values with the plugin's actual default `off` for
the options `lowercase`, `read_from_tail`, and `strip_underscores`; update the
table entries where `lowercase` (currently line 13), `read_from_tail` (line 17)
and `strip_underscores` (line 18) are shown as `false` to read `off` so the docs
match the Fluent Bit plugin behavior.