Stub tests

Update `variadic-functions` concept docs #1314

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Run time

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Job	Run time
Go 1.26.x - ubuntu-24.04/386	49s
Go 1.26.x - windows-2025/386	3m 19s
Go 1.26.x - windows-2025/amd64	3m 14s
Go 1.26.x - macOS-latest/amd64	1m 42s
Go 1.26.x - ubuntu-24.04/amd64	53s
	9m 57s