fix `RangeBounds::is_empty` documentation One-sided ranges are never empty follow-up for https://github.com/rust-lang/rust/pull/137304#pullrequestreview-2646899461
fix `RangeBounds::is_empty` documentation One-sided ranges are never empty follow-up for https://github.com/rust-lang/rust/pull/137304#pullrequestreview-2646899461