RFE: Comment in javax.lang.model.Source version implies non-sealed should be a keyword

[Ethan McCue]

New here, so apologies If I am doing the procedure wrong.

https://github.com/openjdk/jdk/blob/master/src/java.compiler/share/classes/javax/lang/model/SourceVersion.java#L465

This comment implies that once sealed classes would be made a non-preview
feature that `non-sealed` should be added to this predicate. I think the
current behavior is correct since it's a contextual keyword, but the
comment should probably go.

If I am right and that is the case, my understanding is that I need a
sponsor in order to make a PR to delete those lines. Is that correct?
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