Improved Javadoc.

Author: atsticks

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

@@ -12,8 +12,10 @@
 
 
 /**
-* 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.
+ */
 @FunctionalInterface
 public interface ExchangeRateProviderSupplier{