Update example-architectures.md

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@@ -3,7 +3,7 @@ The actors illustrated the [actors and transactions](actors-transactions.html) c
 This page provides some examples with some information on how this can be specified.
 
 
-## Central prescription repository
+### Central prescription repository
 
 In the central prescription repository, the order placer communicates the prescriptions with a central prescription repository (which therefore implements the specification (actors) of Order Receiver and Order Responder).
 Similarly, the Order Consumer consults that repository for checking which prescriptions are available and to fetch the information of those prescriptions.