[Destinations] Improve Options Class (#958)

Author: MatKuhr

cloudplatform/connectivity-destination-service/src/main/java/com/sap/cloud/sdk/cloudplatform/connectivity/DestinationServiceOptionsAugmenter.java

@@ -163,8 +163,13 @@ public enum CrossLevelScope
 
         private final String identifier;
 
+        /**
+         * Return the suffix to be appended to e.g. a destination or fragment name.
+         *
+         * @return The suffix including the leading '@' character.
+         */
         @Nonnull
-        String getSuffix()
+        public String getSuffix()
         {
             return "@" + identifier;
         }