Use ‘:’ consistently in handling[…]javascript.md

The first code snippet is introduced by a sentence ending by ‘:’.
The commit makes the second snippet use the same formatting.

Author: PaulCapron

scripting-docs/jswinrt/handling-windows-runtime-events-in-javascript.md

@@ -30,7 +30,7 @@ locator.addEventListener(
     });  
 ```  
 
- You can also set the `locator.onpositionchanged` property.  
+ You can also set the `locator.onpositionchanged` property:  
 
 ```JavaScript  
 locator.onpositionchanged =