[java-highlighting] Minor fixes in switch statement highlighting

Part of IDEA-365344 Create a new Java error highlighter with minimal dependencies (PSI only)

GitOrigin-RevId: 2924ae6c9984caa6e8a45f640c4de54e02134ad3

java/java-psi-impl/src/com/intellij/psi/util/JavaPsiSwitchUtil.java

@@ -173,7 +173,7 @@ public final class JavaPsiSwitchUtil {
     SelectorKind(@Nullable JavaFeature feature) { myFeature = feature; }
 
     /**
-     * @return java feature required for this selector kind; null if it's always available
+     * @return java feature required for this selector kind; null if it's always available or non-applicable
      */
     public @Nullable JavaFeature getFeature() {
       return myFeature;