* doc/globals.rdoc:  Document what setting $VERBOSE does.  [Bug #7899]

* doc/globals.rdoc:  Added pointer to $-w and $-v for full
  documentation.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39364 b2dd03c8-39d4-4d8f-98ff-823fe69b080e