RFR: JDK-8277003 - JumpableGenerator.rngs() documentation refers to wrong method

[Jim Laskey]

Documentation in `RandomGenerator.rngs()` refers to `JumpableGenerator.jump()` when it should be `JumpableGenerator.jumps()`

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Commit messages:
 - 8273792 - JumpableGenerator.rngs() documentation refers to wrong method

Changes: https://git.openjdk.java.net/jdk/pull/6352/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6352&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8277003
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6352.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6352/head:pull/6352

PR: https://git.openjdk.java.net/jdk/pull/6352