Summary

Update informative description of SourceVersion.RELEASE_14 to mention switch expressions.

Problem

The summary of the new features in the release is out of date.

Solution

Update the feature list of the release to include switch expressions.

Specification

     /**
      * The version recognized by the Java Platform, Standard Edition
      * 14.
      *
+     * Additions in this release include switch expressions.
+     *
      * @since 14
      */
      RELEASE_14;