RFR: JDK-8028712 : Tidy warnings cleanup for java.sql package

[Serge]

Hi all,
please review the fix
http://cr.openjdk.java.net/~yan/8028712/webrev.02/  <http://cr.openjdk.java.net/%7Eyan/8028712/webrev.02/>
for
https://bugs.openjdk.java.net/browse/JDK-8028712

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

Best regards,
Serge V. Lugovoy