fix description in traits.rs #2375

Job	Run time
Build Benchmarks	59s
Build Benchmarks (w/ yoga)	1m 15s
Build [debug feature]	42s
Build Examples	1m 6s
MSRV Build [Rust 1.65]	1m 56s
Clippy	1m 23s
Documentation	5m 56s
Test Fixture Formatting	47s
Rustfmt	6s
Markdown Lint	3s
Test Suite [alloc + all algorithms]	1m 43s
Test Suite [std + block)]	1m 41s
Test Suite [default features]	1m 43s
Test Suite [default except content_size]	1m 40s
Test Suite [default + serde]	1m 46s
Test Suite [std + flexbox]	1m 38s
Test Suite [std + grid]	1m 40s
Test Suite [alloc + no algorithms]	1m 35s
Test Suite [std (no algorithms)]	1m 36s
Test Suite [no features]	1m 34s
	30m 49s

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