Fix the notation in Transform2D's documentation. (#524) #89

Job	Run time
Check code formatting	3s
Linux (1.56.0)	1m 54s
Linux (stable)	21s
Linux (beta)	22s
Linux (nightly)	18s
Linux (--features serde, 1.56.0)	2m 4s
Linux (--features serde, stable)	32s
Linux (--features serde, beta)	23s
Linux (--features serde, nightly)	22s
Linux (--no-default-features --features libm, 1.56.0)	1m 53s
Linux (--no-default-features --features libm, stable)	17s
Linux (--no-default-features --features libm, beta)	19s
Linux (--no-default-features --features libm, nightly)	18s
Linux (stable, --features mint)	13s
Linux (stable, --features bytemuck)	14s
Linux (stable, --features arbitrary)	27s
Linux (nightly, --features unstable)	20s
Linux (nightly, --features unstable,serde)	23s
Result	1s
	10m 44s

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