update documentation "GlobalTool.md"

Author: Bertk

Documentation/GlobalTool.md

@@ -17,7 +17,7 @@ Arguments:
   <ASSEMBLY|DIRECTORY>                  Path to the test assembly or application directory.
 
 Options:
-  -h|--help                             Show help information
+  --help                                Show help information
   -v|--version                          Show version information
   -t|--target                           Path to the test runner application.
   -a|--targetargs                       Arguments to be passed to the test runner.