RFR: 8310828: java.sql java.sql.rowset packages have no `@since` info

[Lance Andersen]

Hi all,

Please review this trivial change which adds the `@since` javadoc tag to the various ` java.sql `and `java.sql.rowset` packages.

Best
Lance

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Commit messages:
 - Remove empty line
 - Add @since to package-info.java

Changes: https://git.openjdk.org/jdk/pull/14652/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14652&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8310828
  Stats: 19 lines in 7 files changed: 7 ins; 4 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/14652.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14652/head:pull/14652

PR: https://git.openjdk.org/jdk/pull/14652