8231663: Incorrect GPL header in some RMI/SQL package-info.java files

[Roger Riggs]

Please review a few trivial changes in rmi and sql to remove extraneous 
<p> tags.

Webrev:
  http://cr.openjdk.java.net/~rriggs/webrev-header-cleanup-8231663/
Issue:
  https://bugs.openjdk.java.net/browse/JDK-8231663

Thanks, Roger