tail: drop outdated comment about <&-

[oech3]

> tail <&-
tail: cannot fstat 'standard input': Bad file descriptor
tail: no files remaining

[codspeed-hq]

Merging this PR will improve performance by 9.44%

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 1 improved benchmark
✅ 285 untouched benchmarks
⏩ 83 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Memory	cp_recursive_deep_tree[(120, 4)]	615.6 KB	562.5 KB	+9.44%

Tip

Curious why this is faster? Comment @codspeedbot explain why this is faster on this PR, or directly use the CodSpeed MCP with your agent.

---

_{Comparing oech3:patch-2 (85a6df9) with main (82ff021)}

Footnotes

1. 83 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. ↩

[cakebaker]

Thanks!