Update launch.md for args to include comment about doublequoting (#1794)

* Update launch.md

* Update launch.md

Author: pieandcakes

launch.md

@@ -70,7 +70,7 @@ Set or change the following options to control VS Code's behavior during debuggi
 The following options enable you to modify the state of the target application when it is launched:
 
 * #### `args`
-  JSON array of command line arguments to pass to the program when it is launched. Example `["arg1", "arg2]`.
+  JSON array of command line arguments to pass to the program when it is launched. Example `["arg1", "arg2"]`. If you are escaping characters you will need to double escape them. For example `["{\\\"arg\\\": true}]` will send `{"arg1": true}` to your application.
 
 * #### `cwd`
   Sets the the working directory of the application launched by the debugger.