<i18n dev> RFR: 8263890: Broken links to Unicode.org

[Naoto Sato]

Fixed several broken links to Unicode.org.

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Commit messages:
 - 8263890: Broken links to Unicode.org

Changes: https://git.openjdk.java.net/jdk/pull/3093/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3093&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8263890
  Stats: 22 lines in 8 files changed: 0 ins; 0 del; 22 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3093.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3093/head:pull/3093

PR: https://git.openjdk.java.net/jdk/pull/3093