RFR: JDK-8310908: Non-standard `@since` tag in `com.sun.java.accessibility.util.package-info`

[Jonathan Gibbons]

Please review a trivial update to normalize an `@since` tag.

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Commit messages:
 - JDK-8310908: Non-standard `@since` tag in `com.sun.java.accessibility.util.package-info`

Changes: https://git.openjdk.org/jdk/pull/14663/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14663&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8310908
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/14663.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14663/head:pull/14663

PR: https://git.openjdk.org/jdk/pull/14663