Updated to immediate Subordinates

Federation_Registry.puml

@@ -3,7 +3,7 @@ hide footbox
 title NREN Registry flow
 entity "Leaf\nEntity" as leaf
 entity NREN as nren
-database Subordinates as subs
+database "(immediate)\n Subordinates" as subs
 
 leaf -> nren: Express interest joining
 nren -> nren
@@ -30,6 +30,6 @@ Leaf entity Adds TM to configuration
 end note
 
 leaf -> nren: Go to enroll endpoint
-nren -> subs: Add leaf entity to subordinates
+nren -> subs: Add leaf entity to\n(immediate) Subordinates
 
-@enduml
+@enduml
\ No newline at end of file