RFR: 8287440: Typo in package-info.java of java.util.random

[Anthony Vanelverdinghe]

The change is trivial, but I'll need help from someone to create a JBS issue & sponsor this PR.

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Commit messages:
 - Copy edit: remove pleonasm

Changes: https://git.openjdk.java.net/jdk/pull/8766/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8766&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8287440
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8766.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8766/head:pull/8766

PR: https://git.openjdk.java.net/jdk/pull/8766