Fix diagram arrows

docs/federation_example.md

@@ -45,8 +45,8 @@ sequenceDiagram
         Remote_1-->>-Remote_0: SubQuery Data
     end
     opt Remote data
-        Local->>+Remote_3: SPARQL Data SubQuery
-        Remote_3-->>-Local: SubQuery Data
+        Remote_0->>+Remote_3: SPARQL Data SubQuery
+        Remote_3-->>-Remote_0: SubQuery Data
     end
     Remote_0-->>-Local: Query Data
     Note over Remote_0,Local: TODO INSERT Data