docs: add documentation for kms universe domain and endpoint properties #2094

Job	Run time
parallel-NativeTests (alloydb-sample)	12m 17s
parallel-NativeTests (bigquery-sample)	12m 22s
parallel-NativeTests (bigquery)	12m 15s
parallel-NativeTests (core)	9m 20s
parallel-NativeTests (data-firestore)	12m 30s
parallel-NativeTests (data-firestore-sample)	11m 56s
parallel-NativeTests (datastore)	11m 25s
parallel-NativeTests (datastore-basic-sample)	11m 39s
parallel-NativeTests (kms)	11m 27s
parallel-NativeTests (kms-sample)	11m 55s
parallel-NativeTests (logging-sample)	12m 18s
parallel-NativeTests (metrics-sample)	15m 4s
parallel-NativeTests (pubsub-sample)	19m 29s
parallel-NativeTests (pubsub-bus-sample)	10m 11s
parallel-NativeTests (pubsub-integration-sample)	36m 31s
parallel-NativeTests (secretmanager)	11m 39s
parallel-NativeTests (secretmanager-sample)	12m 24s
parallel-NativeTests (spanner)	23m 16s
parallel-NativeTests (sql-mysql-sample)	11m 14s
parallel-NativeTests (sql-postgres-sample)	15m 34s
parallel-NativeTests (starter-firestore-sample)	11m 22s
parallel-NativeTests (storage)	11m 45s
parallel-NativeTests (storage-sample)	9m 34s
parallel-NativeTests (trace-sample)	13m 30s
parallel-NativeTests (vision)	13m 14s
parallel-NativeTests (vision-sample)	12m 25s
	5h 56m 36s

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