RFR (XXXS) 8178520: jshell tool: /help /save -- incorrect description of /save -start

[Robert Field]

Please review this one word fix in the /help documentation.  The 
semantics of the option changed but the /help hadn't caught up. Changes 
"default" to "current".

Bug:

     https://bugs.openjdk.java.net/browse/JDK-8178520

Webrev:

     http://cr.openjdk.java.net/~rfield/8178520v0.webrev/

Or probably easier:

      Save the source of all snippets to the file.\n\t\
      Includes source including overwritten, failed, and start-up code.\n\n\
  /save -history <file>\n\t\
      Save the sequential history of all commands and snippets entered since jshell was launched.\n\n\
  /save -start <file>\n\t\
-    Save the default start-up definitions to the file.
+    Save the current start-up definitions to the file.



Thanks,
Robert