RFR: JDK-8185589: jdk.management API has accessibility issues

[Jonathan Gibbons]

Please review this reasonably simple doc fix for some tables in the 
jdk.management API documentation.

JBS: https://bugs.openjdk.java.net/browse/JDK-8185589
Webrev: http://cr.openjdk.java.net/~jjg/8185589/webrev.00/

-- Jon