Fix the notation in Transform2D's documentation #86

Job	Run time
Check code formatting	8s
Linux (1.56.0)	1m 17s
Linux (stable)	11s
Linux (beta)	18s
Linux (nightly)	21s
Linux (--features serde, 1.56.0)	1m 26s
Linux (--features serde, stable)	25s
Linux (--features serde, beta)	23s
Linux (--features serde, nightly)	24s
Linux (--no-default-features --features libm, 1.56.0)	1m 21s
Linux (--no-default-features --features libm, stable)	13s
Linux (--no-default-features --features libm, beta)	20s
Linux (--no-default-features --features libm, nightly)	19s
Linux (stable, --features mint)	29s
Linux (stable, --features bytemuck)	12s
Linux (stable, --features arbitrary)	13s
Linux (nightly, --features unstable)	21s
Linux (nightly, --features unstable,serde)	25s
Result	1s
	8m 47s

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