RFR: 8263890: Broken links to Unicode.org

Fixed several broken links to Unicode.org. ------------- 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