chore: Remove todo pertaining to generalizing `vector_mul` #103

Job	Run time
Build and Test (x86_64-unknown-linux-gnu, ubuntu-latest)	2m 54s
Build and Test (aarch64-unknown-linux-gnu, linux-arm64)	4m 46s
Build and Test (x86_64-apple-darwin, macos-13)	2m 45s
Build and Test (aarch64-apple-darwin, macos-14)	1m 31s
Build and Test (x86_64-pc-windows-gnu, windows-latest)	3m 33s
Publish in order	0s
	15m 29s

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