<i18n dev> RFR: 8211449" Correction to the spec of implicit negative subpattern in DecimalFormat

[Naoto Sato]

Hi,

Please review this doc only fix to the class description of `DecimalFormat` class. `localized minus sign` has never been (and should never be) used in the implicit negative subpattern. Actual implementation correctly uses ascii minus sign for that purpose, so there won't be any compatibility issues.

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Commit messages:
 - 8211449: Correction to the spec of implicit negative subpattern in DecimalFormat

Changes: https://git.openjdk.java.net/jdk/pull/1325/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1325&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8211449
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1325.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1325/head:pull/1325

PR: https://git.openjdk.java.net/jdk/pull/1325