<i18n dev> [10] RFR JDK-8186713: Document default rounding mode in NumberFormat

[Nishit Jain]

Hi,

Please review the fix for JDK-8186713

Bug: https://bugs.openjdk.java.net/browse/JDK-8186713
Webrev: http://cr.openjdk.java.net/~nishjain/8186713/webrev.00/
CSR: https://bugs.openjdk.java.net/browse/JDK-8185777

Fix: Updated the specification of NumberFormat about the default 
rounding mode used while formatting the numbers. Also, in the 
specification of java.util.Formatter, changed the reference of the 
deprecated BigDecimal.ROUND_HALF_UP,with java.math.RoundingMode.HALF_UP.

Regards,
Nishit Jain