RFR: JDK-8260690: JConsole User Guide Link from the Help menu is not accessible by keyboard

[K Suman Rajkumaar]

Hi All,

Could you please review this JConsole fix for JDK-17?

Problem:
JConsole User Guide Link from the Help menu is not accessible by keyboard.

Fix:
The JConsole User Guide Link can be highlighted and can now be accessed using keyboard.

Using the TAB key, the link can be highlighted and ENTER or SPACE key will browse the link.

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Commit messages:
 - Update AboutDialog.java
 - Deleted tabs
 - Fix - JDK-8260690 JConsole User Guide Link from the Help menu is not accessible by keyboard.

Changes: https://git.openjdk.java.net/jdk/pull/3587/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3587&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/jdk/pull/3587.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3587/head:pull/3587

PR: https://git.openjdk.java.net/jdk/pull/3587