website/docs: Flesh out Google Workspaces SAML. #27638

Job	Run time
lint-golint	1m 13s
test-unittest	3m 57s
ci-outpost-mark	2s
build-container (proxy)	3m 4s
build-binary (proxy, linux, amd64)	1m 46s
build-container (ldap)	2m 19s
build-binary (proxy, linux, arm64)	1m 53s
build-container (radius)	2m 19s
build-binary (ldap, linux, amd64)	1m 49s
build-container (rac)	2m 20s
build-binary (ldap, linux, arm64)	1m 43s
build-binary (radius, linux, amd64)	1m 49s
build-binary (radius, linux, arm64)	1m 45s
build-binary (rac, linux, amd64)	1m 54s
build-binary (rac, linux, arm64)	1m 39s
	29m 32s

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