Update README.md for Hello World sample

Small doc edit.

samples/hello_world/README.md

@@ -164,7 +164,7 @@ Linux
 
 Windows
 
-- From a Developer Command for VS2015 run `build.cmd`. `build.cmd` produces a folder called `build` in the root repo folder. This is where the two module dlls and executable used in this sample are built.
+- `build.cmd` produces a folder called `build` in the root repo folder. This is where the two module dlls and executable used in this sample are built.
 > Note: The logger module is built as `\modules\logger\Debug\logger.dll`. The hello world module is built as `\modules\hello_world\Debug\hello_world.dll`. The sample exe is built as `\samples\hello_world\Debug\hello_world_sample.exe`.
 
 - The hello_world_sample process takes the path to a JSON configuration file as an argument in the command line. An example JSON file has been provided as part of the repo at `azure-iot-gateway-sdk\samples\hello_world\src\hello_world_win.json' and is copied below. It will work as is unless you have modified the build script to place modules or sample executables in non-default locations.