docs: correctly document `result` output parameter (#13953) #3264

Job	Run time
Build & push linux (linux/amd64, workflow-controller)	3m 47s
Build & push linux (linux/amd64, argocli)	5m 28s
Build & push linux (linux/amd64, argoexec)	5m 58s
Build & push windows	14m 29s
Build & push linux (linux/arm64, workflow-controller)	30m 23s
Build & push linux (linux/arm64, argocli)	47m 8s
Build & push linux (linux/arm64, argoexec)	36m 54s
Push manifest with all images	31s
Try pulling windows	21s
Try pulling linux/amd64 (linux/amd64, workflow-controller)	13s
Try pulling linux/amd64 (linux/amd64, argocli)	5s
Try pulling linux/amd64 (linux/amd64, argoexec)	6s
publish-release	17m 46s
	2h 43m 9s

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