8278574: update --help-extra message to include default value of --finalization option

Reviewed-by: sundar, alanb, lancea, mchung

Author: Stuart Marks

src/java.base/share/classes/sun/launcher/resources/launcher.properties

@@ -196,8 +196,9 @@ java.launcher.X.usage=\n\
 \    --source <version>\n\
 \                      set the version of the source in source-file mode.\n\
 \    --finalization=<value>\n\
-\                      controls finalization\n\
-\                      <value> is one of "enabled" or "disabled"\n\n\
+\                      controls whether the JVM performs finalization of objects,\n\
+\                      where <value> is one of "enabled" or "disabled".\n\
+\                      Finalization is enabled by default.\n\n\
 These extra options are subject to change without notice.\n
 
 # Translators please note do not translate the options themselves