docs(linter): Improve the Options documentation for no-empty-function rule

[connorshea]

Previously this wasn't following the same format as most other rules with options, now it is.

Related to #14743

I tried converting this to auto-gen docs, but I have no idea how to get that working without the compiler complaining, honestly.

[graphite-app]

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[Copilot]

Pull Request Overview

Align the no-empty-function rule documentation with the standard “Options” format used by other rules, improving clarity and consistency.

• Replaces “Configuration” with structured “Options” section and an “allow” subsection including type/default.
• Updates the example to show a focused rule configuration snippet.

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[codspeed-hq]

CodSpeed Performance Report

Merging #14789 will not alter performance

_{Comparing connorshea:cshea/no-empty-function-options (472230d) with main (a64180e)}

Summary

✅ 4 untouched
⏩ 33 skipped¹

Footnotes

1. 33 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[camc314]

Thank you!