RFR: 8297928: Update jdk.internal.javac.PreviewFeature.Feature to reflect JEP 432 and JEP 433

[Jan Lahoda]

The jdk.internal.javac.PreviewFeature.Feature needs to be updated to reflect JEP 432 and JEP 433 properly.

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Commit messages:
 - 8297928: Update jdk.internal.javac.PreviewFeature.Feature to reflect JEP 432 and JEP 433

Changes: https://git.openjdk.org/jdk/pull/11447/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11447&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8297928
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/11447.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11447/head:pull/11447

PR: https://git.openjdk.org/jdk/pull/11447