RFR: 8261621: Delegate Unicode history from JLS to j.l.Character [v4]

[Naoto Sato]

> Please review this doc fix to j.l.Character, which now includes the table of the history of supported Unicode versions. A corresponding CSR will be filed accordingly.

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

  Added a text about the variations from the base Unicode versions.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2538/files
  - new: https://git.openjdk.java.net/jdk/pull/2538/files/b94b41c8..c90cd663

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2538&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2538&range=02-03

  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2538.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2538/head:pull/2538

PR: https://git.openjdk.java.net/jdk/pull/2538