Fix code formatting issue with included file

_includes/dev-docs/native-image-asset-sizes.md

@@ -1,8 +1,9 @@
 There are two methods for defining sizes for image-like assets (`image` and `icon`).  Both are shown below, but the first example (using `sizes`) is more widely supported by demand partners.
 
-1. Using `mediaTypes.native.image.sizes` (or `mediaTypes.native.icon.sizes` for icons):
+Using `mediaTypes.native.image.sizes` (or `mediaTypes.native.icon.sizes` for icons):
+
+{% highlight js %}
 
-    ```javascript
         mediaTypes: {
             native: {
                 image: {
@@ -11,11 +12,13 @@ There are two methods for defining sizes for image-like assets (`image` and `ico
                 }
             }
         }
-    ```
 
-2. Using `mediaTypes.native.image.aspect_ratios` (or `mediaTypes.native.icon.aspect_ratios` for icons):
+{% endhighlight %}
+
+Using `mediaTypes.native.image.aspect_ratios` (or `mediaTypes.native.icon.aspect_ratios` for icons):
+
+{% highlight js %}
 
-    ```javascript
         mediaTypes: {
             native: {
                 image: {
@@ -28,4 +31,5 @@ There are two methods for defining sizes for image-like assets (`image` and `ico
                 }
             }
         }
-    ```
+
+{% endhighlight %}