RFR [9] 8132877: docs: replace <tt> tags (obsolete in html5) for java.naming

[Alexander Stepanov]

Hello,

Could you please review the following fix:
http://cr.openjdk.java.net/~avstepan/8132877/webrev.00/
for
https://bugs.openjdk.java.net/browse/JDK-8132877

Just some cleanup for docs (replacing obsolete "<tt></tt>").

Thanks,
Alexander