RFR [9] 8133040: docs: replace <tt> tags (obsolete in html5) for java.management

[Alexander Stepanov]

Hello,

Could you please review the following fix:
http://cr.openjdk.java.net/~avstepan/8133040/webrev.00
for
https://bugs.openjdk.java.net/browse/JDK-8133040

specdiffs:
java.lang.management - no changes detected:
http://cr.openjdk.java.net/~avstepan/8133040/java.lang.management/overview-summary.html
javax.management - one (expected) change in TabularDataSupport:
http://cr.openjdk.java.net/~avstepan/8133040/javax.management/openmbean/package-summary.html

Regards,
Alexander