Added more comments

ModuleAPIGameLibRatio.md

@@ -5,9 +5,10 @@ Class used to perform calculation with a ratio.
 ## Example
 
 ```javascript
-//Create test ratio
+//Create test ratio.
 var ratio = api.GameLib.Timing.toRatio(0.25);
 
+//Use it to calculate the x position through an easing.
 var culatedX = ratio.invert().easeInSine().toAbsolute(1920);
 ```