RFR: 8327696: [TESTBUG] "javax/swing/JTable/KeyBoardNavigation/KeyBoardNavigation.java" test instruction needs to be corrected

[Tejesh R]

Instructions set has been updated as per OS specific. JTable keyboard navigation is tested in each OS and according it's current implementation the instructions has been updated (Few has been removed and few has been updated). 
PassFailJFrame.builder is used.

-------------

Commit messages:
 - Instructions updated w.r.t OS + PassFailJFrame.builder usage

Changes: https://git.openjdk.org/jdk/pull/18855/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18855&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327696
  Stats: 177 lines in 1 file changed: 115 ins; 51 del; 11 mod
  Patch: https://git.openjdk.org/jdk/pull/18855.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18855/head:pull/18855

PR: https://git.openjdk.org/jdk/pull/18855