<i18n dev> RFR: 8281317: CompactNumberFormat displays 4-digit values when rounding to a new range

[Naoto Sato]

Fixing an issue in `CompactNumberFormat` which was caused by BigDecimal.divide() that incremented the number in the resulting format string. Also fixing some typos by taking this opportunity.

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Commit messages:
 - 8281317: CompactNumberFormat displays 4-digit values when rounding to a new range

Changes: https://git.openjdk.java.net/jdk/pull/7412/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7412&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8281317
  Stats: 42 lines in 2 files changed: 31 ins; 0 del; 11 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7412.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7412/head:pull/7412

PR: https://git.openjdk.java.net/jdk/pull/7412