Corrected command in build_from_source.md

Fixed an incorrect folder name (Scenes -> scenes) in the Run Executable section of build_from_source.md. The command line example was referencing the wrong directory.

Author: aroraomansh

doc/build_from_source.md

@@ -109,7 +109,7 @@ Now run Configure and select the correct Visual Studio version. Ensure that you
 Execute any demo in the folder "bin" to start the simulator. Alternatively, you can start the simulation by loading a json scene file in the command line:
 
 ```
-./SceneLoaderDemo ../data/Scenes/CarScene.json
+./SceneLoaderDemo ../data/scenes/CarScene.json
 ```
 
 The command loads the selected scene. To start the simulation disable the pause mode by clicking the checkbox or pressing [Space]. More hotkeys are listed [here](getting_started.md).