RFR: 8272859: Javadoc external links should only have feature version number in URL

[Magnus Ihse Bursie]

Link to license terms from the JavaDoc API footer is broken in point releases (for example, 16.0.2). 

Instead of using VERSION_NUMBER, VERSION_FEATURE should be used,

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Commit messages:
 - 8272859: Javadoc external links should only have feature version number in URL

Changes: https://git.openjdk.java.net/jdk/pull/5253/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5253&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8272859
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5253.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5253/head:pull/5253

PR: https://git.openjdk.java.net/jdk/pull/5253