[jdk11u-dev] RFR: 8260690: JConsole User Guide Link from the Help menu is not accessible by keyboard

[Martin Doerr]

Clean backport of JDK-8260690.

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Commit messages:
 - Backport b5d32bbfc716870904e91ce07a09f08929f2563e

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/320/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=320&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8260690
  Stats: 122 lines in 1 file changed: 108 ins; 0 del; 14 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/320.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/320/head:pull/320

PR: https://git.openjdk.java.net/jdk11u-dev/pull/320