RFR: JDK-8280950: RandomGenerator:NextDouble() default behavior non conformant after JDK-8280550 fix

[Joe Darcy]

The original fix to JDK-8280550 contained a typo where r rather than bound was used as the first argument to nextAfter; this PR corrects that issue.

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Commit messages:
 - JDK-8280950: RandomGenerator:NextDouble() default behavior non conformant after JDK-8280550 fix

Changes: https://git.openjdk.java.net/jdk/pull/7292/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7292&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8280950
  Stats: 41 lines in 2 files changed: 39 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7292.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7292/head:pull/7292

PR: https://git.openjdk.java.net/jdk/pull/7292