jmx-dev RFR Doclint cleanup of javax.management

[roger riggs]

Please review and comment.

This changeset addresses the warnings and errors of doclint and
improves the quality of the generated html.
No spec or implementation is changed by this changeset

The changes address issues including html syntax, accessibility issues,
and html tag improper use and list structure.
Refer to the error log attached to the bug report [1] for details.

Please review:
    http://cr.openjdk.java.net/~rriggs/webrev-lint-mgmt-8028014/

Thanks, Roger

[1] https://bugs.openjdk.java.net/browse/JDK-8028014