Review Request for JDK-8074411: Describe "minor unit" and/or "default fraction digits" in Currency class' javadoc clearly

[Nishit Jain]

Hello All,

Please review the following fix in "/Currency.java/".
Bug: https://bugs.openjdk.java.net/browse/JDK-8074411
Webrev: http://cr.openjdk.java.net/~rgoel/Nishit/8074411/ 
<http://cr.openjdk.java.net/%7Ergoel/Nishit/8074411/>

Fix: A clarification about "minor units" and "default number of fraction 
digits" is added in the specification. A suggestion to use BigDecimal 
class while working with Currency or monetary values is also added.

Regards,
Nishit Jain