Add missing endregion marker in samples #481

Job	Run time
test / EventStore.Client.Streams/ubuntu-latest/net6.0/previous-lts	8m 14s
test / EventStore.Client.PersistentSubscriptions/ubuntu-latest/net6.0/previous-lts	9m 35s
test / EventStore.Client.Operations/ubuntu-latest/net6.0/previous-lts	1m 29s
test / EventStore.Client.UserManagement/ubuntu-latest/net6.0/previous-lts	1m 45s
test / EventStore.Client.ProjectionManagement/ubuntu-latest/net6.0/previous-lts	1m 31s
test / EventStore.Client.Streams/ubuntu-latest/net7.0/previous-lts	7m 51s
test / EventStore.Client.PersistentSubscriptions/ubuntu-latest/net7.0/previous-lts	9m 47s
test / EventStore.Client.Operations/ubuntu-latest/net7.0/previous-lts	1m 28s
test / EventStore.Client.UserManagement/ubuntu-latest/net7.0/previous-lts	1m 25s
test / EventStore.Client.ProjectionManagement/ubuntu-latest/net7.0/previous-lts	1m 35s
test / EventStore.Client.Streams/ubuntu-latest/net8.0/previous-lts	8m 49s
test / EventStore.Client.PersistentSubscriptions/ubuntu-latest/net8.0/previous-lts	9m 35s
test / EventStore.Client.Operations/ubuntu-latest/net8.0/previous-lts	1m 18s
test / EventStore.Client.UserManagement/ubuntu-latest/net8.0/previous-lts	1m 48s
test / EventStore.Client.ProjectionManagement/ubuntu-latest/net8.0/previous-lts	1m 30s
	1h 7m 40s

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