docs: Fix two small typos in "What is Consul?" introduction #16429

Job	Run time
Setup	6s
get-go-version / Determine Go toolchain version	6s
check-go-mod / check-go-mod	26s
build-386	2m 3s
build-amd64	3m 12s
build-s390x	0s
build-arm	2m 54s
build-distros-success	3s
	8m 50s

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