providers/radius: property mapping docs #23472

Job	Run time
lint-golint	45s
test-unittest	2m 29s
ci-outpost-mark	1s
build-binary (proxy, linux, amd64)	2m 8s
build-binary (proxy, linux, arm64)	2m 22s
build-container (proxy)	2m 42s
build-binary (ldap, linux, amd64)	2m 18s
build-container (ldap)	2m 46s
build-binary (ldap, linux, arm64)	2m 8s
build-container (radius)	2m 22s
build-binary (radius, linux, amd64)	2m 21s
build-container (rac)	2m 23s
build-binary (radius, linux, arm64)	2m 14s
build-binary (rac, linux, amd64)	2m 5s
build-binary (rac, linux, arm64)	2m 9s
	31m 13s

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