RFR 8165035 jar --help-extra should provide information on the -n/--normalize option

[Paul Sandoz]

Hi,

Please review this minor fix to the --help-extra option to to report the -n/--normalize option:

  http://cr.openjdk.java.net/~psandoz/jdk9/JDK-8165035-jar-tool-n/webrev/

It will report the following (and will be formatted correctly for a fixed width font):

"
 Operation modifiers valid only in create mode:

  -n, --normalize            Normalize information in the new jar archive
                             after creation
“

Paul.