docs: standard-input: fix config params, case, code blocks

[eschabell]

• Fix config parameter table keys to use lowercase (buffer_size, parser, threaded) to match docs standards
• Fix classic config examples to use title case (Name, Format, Regex, Parsers_File)
• Change code block language from bash to shell for script examples

Fixes #2351

Summary by CodeRabbit

• Documentation
  • Updated configuration examples to use lowercase key names for consistency
  • Improved code block formatting for clarity

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[coderabbitai]

📝 Walkthrough

Walkthrough

Documentation update that standardizes configuration key naming from mixed case (Buffer_Size, Parser, Threaded) to lowercase snake_case (buffer_size, parser, threaded) in the standard input plugin documentation, with code fence language identifier adjustments.

Changes

Cohort / File(s)	Summary
Standard Input Documentation Cleanup pipeline/inputs/standard-input.md	Standardizes configuration parameter keys to lowercase snake_case throughout documentation and examples; updates code fence language identifiers from bash to shell

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Possibly related PRs

• #2330: Standardizes input plugin configuration keys from CamelCase to lowercase_snake_case in documentation
• #2250: Standardizes configuration key casing (e.g., Threaded → threaded, Parser → parser) across input plugin docs
• #2275: Modifies documentation around parser configuration including parser/parsers_file keys and examples

Suggested labels

4.2.3

Suggested reviewers

• cosmo0920
• patrick-stephens

Poem

🐰 A documentation hop,
Keys now lowercase won't stop,
From camelCase to snake so neat,
Consistency makes docs complete!
Snake_case wins the day. 🎉

🚥 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 clearly and concisely summarizes the main changes: documentation fixes for configuration parameter cases and code block formatting in the standard-input documentation.
Linked Issues check	✅ Passed	The PR addresses all primary objectives from issue #2351: standardizing configuration parameter keys to lowercase, correcting mixed-case usage in example configurations, and updating code block formatting.
Out of Scope Changes check	✅ Passed	All changes are directly related to issue #2351: documentation updates for the standard-input plugin involving configuration key casing, example formatting, and code block language identifiers.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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