polishing

docs/GettingStartedSynthDet.md

@@ -18,14 +18,14 @@ The project will now be listed in Unity Hub. If you see a warning regarding Unit
 3. In Unity Editor's ***Project*** window, find the **Scenes** folder and open the **SynthDet** Scene.
    
 <p align="center">
-<img src="images/SynthDetScene.PNG" width = "500"/>
+<img src="images/SynthDetScene.png" width = "500"/>
 </p>
 
 ### Step 2: Generate data locally 
 1. With the `SynthDet` Scene open, press the the **▷** (play) button located at the top middle section of the editor to run your simulation. The sample project quickly generates a collection of random images, which you can see in the ***Game*** view. 
 
 <p align="center">
-    <img src="images/play.PNG" width = "400"/>
+    <img src="images/play.png" width = "400"/>
 </p>
 
 2. The `SynthDet` Scene continues for about one minute, then exits Play mode. Allow the Scene to run until it exits Play mode.

docs/Prerequisites.md

@@ -53,7 +53,7 @@ The `<URL-unity_simulation_bundle.zip>` address can be found at the same page li
 
 #### Linux build support
 
-To use Unity Simulation, your Unity installation needs to have Linux Build Support. If you did not check the related option when installing Unity, you can add the modules now. 
+To use Unity Simulation, your Unity installation needs to have Linux Build Support. If you did not check the related option when installing Unity, you can add the module now. 
 1. In Unity Hub, go the the ***Installs*** tab.
 2. Click on the options menu icon (...) for your desired Unity version, and then click ***Add Modules***.
 3. If the Linux Build Support (Mono) option is already checked, it means you have already installed this module. If not, check the option and click ***Done***.