update drconfig help message - add missing '\n' - show nudge option only in Windows
update drconfig help message
- add missing '\n'
- show nudge option only in Windows

R=bruening@google.com
BUG=none

Review URL: https://codereview.appspot.com/136310043

SVN-Revision: 2829

AmesianX/dynamorio,daksunt/dynamorio,bl4ckic3/dynamorio,bl4ckic3/dynamorio,sigma-random/dynamorio,sigma-random/dynamorio,code4bones/dynamorio,daksunt/dynamorio,sigma-random/dynamorio,code4bones/dynamorio,AmesianX/dynamorio,code4bones/dynamorio,AmesianX/dynamorio,sigma-random/dynamorio,bl4ckic3/dynamorio,code4bones/dynamorio,code4bones/dynamorio,AmesianX/dynamorio,bl4ckic3/dynamorio,bl4ckic3/dynamorio,daksunt/dynamorio,daksunt/dynamorio,sigma-random/dynamorio,daksunt/dynamorio,AmesianX/dynamorio