RFR: 8281317: CompactNumberFormat displays 4-digit values when rounding to a new range [v2]

[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.

Naoto Sato has updated the pull request incrementally with one additional commit since the last revision:

  Addressing review comments

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7412/files
  - new: https://git.openjdk.java.net/jdk/pull/7412/files/8ea8ccfa..f6c86254

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7412&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7412&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 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