Add missing endregion marker in samples #481

Job	Run time
test / EventStore.Client.Streams/ubuntu-latest/net6.0/lts	11m 33s
test / EventStore.Client.PersistentSubscriptions/ubuntu-latest/net6.0/lts	9m 35s
test / EventStore.Client.Operations/ubuntu-latest/net6.0/lts	2m 28s
test / EventStore.Client.UserManagement/ubuntu-latest/net6.0/lts	2m 39s
test / EventStore.Client.ProjectionManagement/ubuntu-latest/net6.0/lts	1m 54s
test / EventStore.Client.Streams/ubuntu-latest/net7.0/lts	12m 20s
test / EventStore.Client.PersistentSubscriptions/ubuntu-latest/net7.0/lts	9m 51s
test / EventStore.Client.Operations/ubuntu-latest/net7.0/lts	2m 31s
test / EventStore.Client.UserManagement/ubuntu-latest/net7.0/lts	2m 9s
test / EventStore.Client.ProjectionManagement/ubuntu-latest/net7.0/lts	1m 42s
test / EventStore.Client.Streams/ubuntu-latest/net8.0/lts	11m 20s
test / EventStore.Client.PersistentSubscriptions/ubuntu-latest/net8.0/lts	9m 41s
test / EventStore.Client.Operations/ubuntu-latest/net8.0/lts	2m 48s
test / EventStore.Client.UserManagement/ubuntu-latest/net8.0/lts	2m 30s
test / EventStore.Client.ProjectionManagement/ubuntu-latest/net8.0/lts	1m 55s
	1h 24m 56s

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