docs(overview): Fix event data region in mermaid (#13643)

docs(overview): Fix event data region in mermaid

Fix the Event Data name to reflect silo region.

Author: itaybre

develop-docs/application-architecture/overview.mdx

@@ -121,7 +121,7 @@ flowchart TD
 
   subgraph usr [US Region]
     usapi[US Sentry API] --> uspg[(US Postgres)]
-    usapi --> used[(EU Event Data)]
+    usapi --> used[(US Event Data)]
   end
 
   subgraph cs [Control Silo]