Summary
-------
Remove references to obsolete Xdebug flag from JDWP help.

Problem
-------
The help information returned by "java -Xrunjdwp:help"  command shows the usage of obsolete Xdebug option that has been a no-op flag since JDK 6.

Solution
--------
Remove references to Xdebug flag from JDWP help.

Specification
-------------
 The following fragment retuned by "java -Xrunjdwp:help"

    - The older -Xrunjdwp interface can still be used, but will be removed in
      a future release, for example:
          java -Xdebug -Xrunjdwp:[help]|[<option>=<value>, ...]

will be replaced with:

    - The older -Xrunjdwp interface can still be used, but will be removed in
      a future release, for example:
          java -Xrunjdwp:[help]|[<option>=<value>, ...]