Improved Javadoc.

Author: atsticks

src/main/java/javax/money/convert/ExchangeRateProviderSupplier.java

@@ -10,7 +10,9 @@
 
 
 /**
- * A supplier of {@link ExchangeRateProvider} name that references an implementation.
+ * A supplier of {@link ExchangeRateProvider} name that references an implementation. This can be used to let
+ * an enum type implement this interface, so enums values can be passed to {@link javax.money.convert.MonetaryConversions}
+ * for determining the rate providers to be used.
  */
 public interface ExchangeRateProviderSupplier{