Exercise tests

Update `variadic-functions` concept docs #4095

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Run time

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Job	Run time
Go 1.26.x - macOS-latest/amd64	1m 13s
Go 1.26.x - windows-2025/amd64	2m 15s
Go 1.26.x - windows-2025/386	2m 12s
Go 1.26.x - ubuntu-24.04/amd64	49s
Go 1.26.x - ubuntu-24.04/386	49s
	7m 18s

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