fix(focs): clarify MasterAccountController address retrieval process (#1250)

Author: fassko

docs/smart-accounts/4-reference.mdx

@@ -13,7 +13,8 @@ import SmartAccountsReference from "@site/src/features/SmartAccounts/Reference";
 <SmartAccountsReference />
 
 :::info
-The `MasterAccountController` address should be retrieved programmatically from the [Flare contracts registry](/network/guides/flare-contracts-registry) rather than hardcoding it, as it may change across network deployments.
+The `MasterAccountController` address is the same on all Flare [networks](/network/overview).
+Retrieve it from the [Flare contracts registry](/network/guides/flare-contracts-registry) rather than hardcoding it, so each XRPL address maps to the same personal account everywhere.
 :::
 
 ## References