RFR: JDK-8030709 : Tidy warnings cleanup for java.lang package

[Serge]

Hi all.
Please review the fix
http://cr.openjdk.java.net/~yan/8030709/webrev.00/ 
<http://cr.openjdk.java.net/%7Eyan/8030709/webrev.00/>
for https://bugs.openjdk.java.net/browse/JDK-8030709

This patch cleanup tidy warnings for generated html documentation, and do
not affect the appearance of the documentation.


Best regards,
Serge V. Lugovoy